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Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App

Whimbrel

Whimbrel is the companion web app of a three-part immobilizer system (Immogen — Uguisu fob + Guillemot receiver + Whimbrel) for the Ninebot Max G30. It serves two primary functions: flashing firmware updates directly from the browser, and handling the cryptographic generation and secure USB injection of a pre-shared AES-128-CCM key to pair the devices.

This repository contains the Whimbrel static web app. Note that shared protocol and cryptography logic lives in the Immogen monorepo (lib/, Guillemot/, Uguisu/).

Tech Stack

  • Frontend: Vanilla HTML / CSS / JavaScript
  • Cryptography: Web Crypto API for CSPRNG 128-bit key generation
  • Transport: Web Serial API via USB CDC
  • Hosting: GitHub Pages

Provisioning Protocol

Whimbrel uses the Web Serial API because it requires physical USB-C access, eliminating the risk of over-the-air pairing interception and conserving the fob's battery. Firmware exposes no serial commands to read the key back (write-only). Requires Chrome or Edge.

Serial Payload

Whimbrel sends a delimited string to the MCU at 115200 baud: PROV:<128_BIT_HEX_KEY>:<8_HEX_COUNTER>:<CHECKSUM_HEX>\n

Example: PROV:4a2b9c8f...32chars...:00000000:a3f2\n

  • CHECKSUM_HEX is a 4-hex-character CRC-16-CCITT to detect transmission errors.
  • Device Responses: ACK:PROV_SUCCESS\n, ERR:MALFORMED\n, ERR:CHECKSUM\n, or ERR:STORAGE\n (storage write/verify failure).

Ephemeral Memory

The key only exists in the browser's RAM during the pairing session. Once the tab is closed, the key is gone forever. If a device breaks, a new key must be generated and flashed to both the surviving device and the replacement device.

Usage

Whimbrel is completely serverless and offline-capable. Once loaded in Chrome or Edge, it runs entirely in the browser.

Firmware Flashing

Whimbrel can fetch the latest firmware releases from GitHub and flash them via the Nordic Serial DFU protocol over Web Serial.

  1. Switch to the Firmware tab.
  2. Select either the Guillemot Receiver or Uguisu Fob. The app will automatically fetch the latest release version.
  3. Double-tap the reset button on your device to enter Bootloader mode.
  4. Click Flash Firmware, select the bootloader serial port, and wait for the flashing to complete.

Key Provisioning

  1. Generate Secret: Click "Generate New Secret" to create a random 16-byte hex string in RAM.
  2. Flash Uguisu: Plug the Uguisu fob into the PC via USB-C and click "Flash Key Fob". The browser prompts for the serial port.
  3. Flash Guillemot: Plug the Guillemot receiver into the PC via USB-C and click "Flash Receiver". Select its serial port.
  4. Completion: Both devices are synchronized with the same AES key and counter. The system is securely paired.

Safety & Legal

  • This is a prototype security/power-interrupt device. Use at your own risk.
  • Not affiliated with Segway-Ninebot.
  • Do not test “lock” behavior while riding.

About

Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App

lpfchan.github.io/Whimbrel/

Topics

bleimmobilizerninebot-g30nrf52840provisioningpwaweb-serial

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
Whimbrel
Whimbrel is the companion web app of a three-part immobilizer system (Immogen — Uguisu fob + Guillemot receiver + Whimbrel) for the Ninebot Max G30. It serves two primary functions: flashing firmware updates directly from the browser, and handling the cryptographic generation and secure USB injection of a pre-shared AES-128-CCM key to pair the devices.
This repository contains the Whimbrel static web app. Note that shared protocol and cryptography logic lives in the Immogen monorepo (lib/, Guillemot/, Uguisu/).
Tech Stack
  • Frontend: Vanilla HTML / CSS / JavaScript
  • Cryptography: Web Crypto API for CSPRNG 128-bit key generation
  • Transport: Web Serial API via USB CDC
  • Hosting: GitHub Pages
Provisioning Protocol
Whimbrel uses the Web Serial API because it requires physical USB-C access, eliminating the risk of over-the-air pairing interception and conserving the fob's battery. Firmware exposes no serial commands to read the key back (write-only). Requires Chrome or Edge.
Serial Payload
Whimbrel sends a delimited string to the MCU at 115200 baud:
PROV:<128_BIT_HEX_KEY>:<8_HEX_COUNTER>:<CHECKSUM_HEX>\n
Example: PROV:4a2b9c8f...32chars...:00000000:a3f2\n
  • CHECKSUM_HEX is a 4-hex-character CRC-16-CCITT to detect transmission errors.
  • Device Responses: ACK:PROV_SUCCESS\n, ERR:MALFORMED\n, ERR:CHECKSUM\n, or ERR:STORAGE\n (storage write/verify failure).
Ephemeral Memory
The key only exists in the browser's RAM during the pairing session. Once the tab is closed, the key is gone forever. If a device breaks, a new key must be generated and flashed to both the surviving device and the replacement device.
Usage
Whimbrel is completely serverless and offline-capable. Once loaded in Chrome or Edge, it runs entirely in the browser.
Firmware Flashing
Whimbrel can fetch the latest firmware releases from GitHub and flash them via the Nordic Serial DFU protocol over Web Serial.
  1. Switch to the Firmware tab.
  2. Select either the Guillemot Receiver or Uguisu Fob. The app will automatically fetch the latest release version.
  3. Double-tap the reset button on your device to enter Bootloader mode.
  4. Click Flash Firmware, select the bootloader serial port, and wait for the flashing to complete.
Key Provisioning
  1. Generate Secret: Click "Generate New Secret" to create a random 16-byte hex string in RAM.
  2. Flash Uguisu: Plug the Uguisu fob into the PC via USB-C and click "Flash Key Fob". The browser prompts for the serial port.
  3. Flash Guillemot: Plug the Guillemot receiver into the PC via USB-C and click "Flash Receiver". Select its serial port.
  4. Completion: Both devices are synchronized with the same AES key and counter. The system is securely paired.
Safety & Legal
  • This is a prototype security/power-interrupt device. Use at your own risk.
  • Not affiliated with Segway-Ninebot.
  • Do not test “lock” behavior while riding.
About
Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
lpfchan.github.io/Whimbrel/
Topics
bleimmobilizerninebot-g30nrf52840provisioningpwaweb-serial
Resources
Readme
Activity
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0 watching
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0 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
Whimbrel
Whimbrel is the companion web app of a three-part immobilizer system (Immogen — Uguisu fob + Guillemot receiver + Whimbrel) for the Ninebot Max G30. It serves two primary functions: flashing firmware updates directly from the browser, and handling the cryptographic generation and secure USB injection of a pre-shared AES-128-CCM key to pair the devices.
This repository contains the Whimbrel static web app. Note that shared protocol and cryptography logic lives in the Immogen monorepo (lib/, Guillemot/, Uguisu/).
Tech Stack
  • Frontend: Vanilla HTML / CSS / JavaScript
  • Cryptography: Web Crypto API for CSPRNG 128-bit key generation
  • Transport: Web Serial API via USB CDC
  • Hosting: GitHub Pages
Provisioning Protocol
Whimbrel uses the Web Serial API because it requires physical USB-C access, eliminating the risk of over-the-air pairing interception and conserving the fob's battery. Firmware exposes no serial commands to read the key back (write-only). Requires Chrome or Edge.
Serial Payload
Whimbrel sends a delimited string to the MCU at 115200 baud:
PROV:<128_BIT_HEX_KEY>:<8_HEX_COUNTER>:<CHECKSUM_HEX>\n
Example: PROV:4a2b9c8f...32chars...:00000000:a3f2\n
  • CHECKSUM_HEX is a 4-hex-character CRC-16-CCITT to detect transmission errors.
  • Device Responses: ACK:PROV_SUCCESS\n, ERR:MALFORMED\n, ERR:CHECKSUM\n, or ERR:STORAGE\n (storage write/verify failure).
Ephemeral Memory
The key only exists in the browser's RAM during the pairing session. Once the tab is closed, the key is gone forever. If a device breaks, a new key must be generated and flashed to both the surviving device and the replacement device.
Usage
Whimbrel is completely serverless and offline-capable. Once loaded in Chrome or Edge, it runs entirely in the browser.
Firmware Flashing
Whimbrel can fetch the latest firmware releases from GitHub and flash them via the Nordic Serial DFU protocol over Web Serial.
  1. Switch to the Firmware tab.
  2. Select either the Guillemot Receiver or Uguisu Fob. The app will automatically fetch the latest release version.
  3. Double-tap the reset button on your device to enter Bootloader mode.
  4. Click Flash Firmware, select the bootloader serial port, and wait for the flashing to complete.
Key Provisioning
  1. Generate Secret: Click "Generate New Secret" to create a random 16-byte hex string in RAM.
  2. Flash Uguisu: Plug the Uguisu fob into the PC via USB-C and click "Flash Key Fob". The browser prompts for the serial port.
  3. Flash Guillemot: Plug the Guillemot receiver into the PC via USB-C and click "Flash Receiver". Select its serial port.
  4. Completion: Both devices are synchronized with the same AES key and counter. The system is securely paired.
Safety & Legal
  • This is a prototype security/power-interrupt device. Use at your own risk.
  • Not affiliated with Segway-Ninebot.
  • Do not test “lock” behavior while riding.
About
Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
lpfchan.github.io/Whimbrel/
Topics
bleimmobilizerninebot-g30nrf52840provisioningpwaweb-serial
Resources
Readme
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
Whimbrel
Whimbrel is the companion web app of a three-part immobilizer system (Immogen — Uguisu fob + Guillemot receiver + Whimbrel) for the Ninebot Max G30. It serves two primary functions: flashing firmware updates directly from the browser, and handling the cryptographic generation and secure USB injection of a pre-shared AES-128-CCM key to pair the devices.
This repository contains the Whimbrel static web app. Note that shared protocol and cryptography logic lives in the Immogen monorepo (lib/, Guillemot/, Uguisu/).
Tech Stack
  • Frontend: Vanilla HTML / CSS / JavaScript
  • Cryptography: Web Crypto API for CSPRNG 128-bit key generation
  • Transport: Web Serial API via USB CDC
  • Hosting: GitHub Pages
Provisioning Protocol
Whimbrel uses the Web Serial API because it requires physical USB-C access, eliminating the risk of over-the-air pairing interception and conserving the fob's battery. Firmware exposes no serial commands to read the key back (write-only). Requires Chrome or Edge.
Serial Payload
Whimbrel sends a delimited string to the MCU at 115200 baud:
PROV:<128_BIT_HEX_KEY>:<8_HEX_COUNTER>:<CHECKSUM_HEX>\n
Example: PROV:4a2b9c8f...32chars...:00000000:a3f2\n
  • CHECKSUM_HEX is a 4-hex-character CRC-16-CCITT to detect transmission errors.
  • Device Responses: ACK:PROV_SUCCESS\n, ERR:MALFORMED\n, ERR:CHECKSUM\n, or ERR:STORAGE\n (storage write/verify failure).
Ephemeral Memory
The key only exists in the browser's RAM during the pairing session. Once the tab is closed, the key is gone forever. If a device breaks, a new key must be generated and flashed to both the surviving device and the replacement device.
Usage
Whimbrel is completely serverless and offline-capable. Once loaded in Chrome or Edge, it runs entirely in the browser.
Firmware Flashing
Whimbrel can fetch the latest firmware releases from GitHub and flash them via the Nordic Serial DFU protocol over Web Serial.
  1. Switch to the Firmware tab.
  2. Select either the Guillemot Receiver or Uguisu Fob. The app will automatically fetch the latest release version.
  3. Double-tap the reset button on your device to enter Bootloader mode.
  4. Click Flash Firmware, select the bootloader serial port, and wait for the flashing to complete.
Key Provisioning
  1. Generate Secret: Click "Generate New Secret" to create a random 16-byte hex string in RAM.
  2. Flash Uguisu: Plug the Uguisu fob into the PC via USB-C and click "Flash Key Fob". The browser prompts for the serial port.
  3. Flash Guillemot: Plug the Guillemot receiver into the PC via USB-C and click "Flash Receiver". Select its serial port.
  4. Completion: Both devices are synchronized with the same AES key and counter. The system is securely paired.
Safety & Legal
  • This is a prototype security/power-interrupt device. Use at your own risk.
  • Not affiliated with Segway-Ninebot.
  • Do not test “lock” behavior while riding.
About
Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
lpfchan.github.io/Whimbrel/
Topics
bleimmobilizerninebot-g30nrf52840provisioningpwaweb-serial
Resources
Readme
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
Whimbrel
Whimbrel is the companion web app of a three-part immobilizer system (Immogen — Uguisu fob + Guillemot receiver + Whimbrel) for the Ninebot Max G30. It serves two primary functions: flashing firmware updates directly from the browser, and handling the cryptographic generation and secure USB injection of a pre-shared AES-128-CCM key to pair the devices.
This repository contains the Whimbrel static web app. Note that shared protocol and cryptography logic lives in the Immogen monorepo (lib/, Guillemot/, Uguisu/).
Tech Stack
  • Frontend: Vanilla HTML / CSS / JavaScript
  • Cryptography: Web Crypto API for CSPRNG 128-bit key generation
  • Transport: Web Serial API via USB CDC
  • Hosting: GitHub Pages
Provisioning Protocol
Whimbrel uses the Web Serial API because it requires physical USB-C access, eliminating the risk of over-the-air pairing interception and conserving the fob's battery. Firmware exposes no serial commands to read the key back (write-only). Requires Chrome or Edge.
Serial Payload
Whimbrel sends a delimited string to the MCU at 115200 baud:
PROV:<128_BIT_HEX_KEY>:<8_HEX_COUNTER>:<CHECKSUM_HEX>\n
Example: PROV:4a2b9c8f...32chars...:00000000:a3f2\n
  • CHECKSUM_HEX is a 4-hex-character CRC-16-CCITT to detect transmission errors.
  • Device Responses: ACK:PROV_SUCCESS\n, ERR:MALFORMED\n, ERR:CHECKSUM\n, or ERR:STORAGE\n (storage write/verify failure).
Ephemeral Memory
The key only exists in the browser's RAM during the pairing session. Once the tab is closed, the key is gone forever. If a device breaks, a new key must be generated and flashed to both the surviving device and the replacement device.
Usage
Whimbrel is completely serverless and offline-capable. Once loaded in Chrome or Edge, it runs entirely in the browser.
Firmware Flashing
Whimbrel can fetch the latest firmware releases from GitHub and flash them via the Nordic Serial DFU protocol over Web Serial.
  1. Switch to the Firmware tab.
  2. Select either the Guillemot Receiver or Uguisu Fob. The app will automatically fetch the latest release version.
  3. Double-tap the reset button on your device to enter Bootloader mode.
  4. Click Flash Firmware, select the bootloader serial port, and wait for the flashing to complete.
Key Provisioning
  1. Generate Secret: Click "Generate New Secret" to create a random 16-byte hex string in RAM.
  2. Flash Uguisu: Plug the Uguisu fob into the PC via USB-C and click "Flash Key Fob". The browser prompts for the serial port.
  3. Flash Guillemot: Plug the Guillemot receiver into the PC via USB-C and click "Flash Receiver". Select its serial port.
  4. Completion: Both devices are synchronized with the same AES key and counter. The system is securely paired.
Safety & Legal
  • This is a prototype security/power-interrupt device. Use at your own risk.
  • Not affiliated with Segway-Ninebot.
  • Do not test “lock” behavior while riding.
About
Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
lpfchan.github.io/Whimbrel/
Topics
bleimmobilizerninebot-g30nrf52840provisioningpwaweb-serial
Resources
Readme
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
Whimbrel
Whimbrel is the companion web app of a three-part immobilizer system (Immogen — Uguisu fob + Guillemot receiver + Whimbrel) for the Ninebot Max G30. It serves two primary functions: flashing firmware updates directly from the browser, and handling the cryptographic generation and secure USB injection of a pre-shared AES-128-CCM key to pair the devices.
This repository contains the Whimbrel static web app. Note that shared protocol and cryptography logic lives in the Immogen monorepo (lib/, Guillemot/, Uguisu/).
Tech Stack
  • Frontend: Vanilla HTML / CSS / JavaScript
  • Cryptography: Web Crypto API for CSPRNG 128-bit key generation
  • Transport: Web Serial API via USB CDC
  • Hosting: GitHub Pages
Provisioning Protocol
Whimbrel uses the Web Serial API because it requires physical USB-C access, eliminating the risk of over-the-air pairing interception and conserving the fob's battery. Firmware exposes no serial commands to read the key back (write-only). Requires Chrome or Edge.
Serial Payload
Whimbrel sends a delimited string to the MCU at 115200 baud:
PROV:<128_BIT_HEX_KEY>:<8_HEX_COUNTER>:<CHECKSUM_HEX>\n
Example: PROV:4a2b9c8f...32chars...:00000000:a3f2\n
  • CHECKSUM_HEX is a 4-hex-character CRC-16-CCITT to detect transmission errors.
  • Device Responses: ACK:PROV_SUCCESS\n, ERR:MALFORMED\n, ERR:CHECKSUM\n, or ERR:STORAGE\n (storage write/verify failure).
Ephemeral Memory
The key only exists in the browser's RAM during the pairing session. Once the tab is closed, the key is gone forever. If a device breaks, a new key must be generated and flashed to both the surviving device and the replacement device.
Usage
Whimbrel is completely serverless and offline-capable. Once loaded in Chrome or Edge, it runs entirely in the browser.
Firmware Flashing
Whimbrel can fetch the latest firmware releases from GitHub and flash them via the Nordic Serial DFU protocol over Web Serial.
  1. Switch to the Firmware tab.
  2. Select either the Guillemot Receiver or Uguisu Fob. The app will automatically fetch the latest release version.
  3. Double-tap the reset button on your device to enter Bootloader mode.
  4. Click Flash Firmware, select the bootloader serial port, and wait for the flashing to complete.
Key Provisioning
  1. Generate Secret: Click "Generate New Secret" to create a random 16-byte hex string in RAM.
  2. Flash Uguisu: Plug the Uguisu fob into the PC via USB-C and click "Flash Key Fob". The browser prompts for the serial port.
  3. Flash Guillemot: Plug the Guillemot receiver into the PC via USB-C and click "Flash Receiver". Select its serial port.
  4. Completion: Both devices are synchronized with the same AES key and counter. The system is securely paired.
Safety & Legal
  • This is a prototype security/power-interrupt device. Use at your own risk.
  • Not affiliated with Segway-Ninebot.
  • Do not test “lock” behavior while riding.
About
Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
lpfchan.github.io/Whimbrel/
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
Whimbrel
Whimbrel is the companion web app of a three-part immobilizer system (Immogen — Uguisu fob + Guillemot receiver + Whimbrel) for the Ninebot Max G30. It serves two primary functions: flashing firmware updates directly from the browser, and handling the cryptographic generation and secure USB injection of a pre-shared AES-128-CCM key to pair the devices.
This repository contains the Whimbrel static web app. Note that shared protocol and cryptography logic lives in the Immogen monorepo (lib/, Guillemot/, Uguisu/).
Tech Stack
  • Frontend: Vanilla HTML / CSS / JavaScript
  • Cryptography: Web Crypto API for CSPRNG 128-bit key generation
  • Transport: Web Serial API via USB CDC
  • Hosting: GitHub Pages
Provisioning Protocol
Whimbrel uses the Web Serial API because it requires physical USB-C access, eliminating the risk of over-the-air pairing interception and conserving the fob's battery. Firmware exposes no serial commands to read the key back (write-only). Requires Chrome or Edge.
Serial Payload
Whimbrel sends a delimited string to the MCU at 115200 baud:
PROV:<128_BIT_HEX_KEY>:<8_HEX_COUNTER>:<CHECKSUM_HEX>\n
Example: PROV:4a2b9c8f...32chars...:00000000:a3f2\n
  • CHECKSUM_HEX is a 4-hex-character CRC-16-CCITT to detect transmission errors.
  • Device Responses: ACK:PROV_SUCCESS\n, ERR:MALFORMED\n, ERR:CHECKSUM\n, or ERR:STORAGE\n (storage write/verify failure).
Ephemeral Memory
The key only exists in the browser's RAM during the pairing session. Once the tab is closed, the key is gone forever. If a device breaks, a new key must be generated and flashed to both the surviving device and the replacement device.
Usage
Whimbrel is completely serverless and offline-capable. Once loaded in Chrome or Edge, it runs entirely in the browser.
Firmware Flashing
Whimbrel can fetch the latest firmware releases from GitHub and flash them via the Nordic Serial DFU protocol over Web Serial.
  1. Switch to the Firmware tab.
  2. Select either the Guillemot Receiver or Uguisu Fob. The app will automatically fetch the latest release version.
  3. Double-tap the reset button on your device to enter Bootloader mode.
  4. Click Flash Firmware, select the bootloader serial port, and wait for the flashing to complete.
Key Provisioning
  1. Generate Secret: Click "Generate New Secret" to create a random 16-byte hex string in RAM.
  2. Flash Uguisu: Plug the Uguisu fob into the PC via USB-C and click "Flash Key Fob". The browser prompts for the serial port.
  3. Flash Guillemot: Plug the Guillemot receiver into the PC via USB-C and click "Flash Receiver". Select its serial port.
  4. Completion: Both devices are synchronized with the same AES key and counter. The system is securely paired.
Safety & Legal
  • This is a prototype security/power-interrupt device. Use at your own risk.
  • Not affiliated with Segway-Ninebot.
  • Do not test “lock” behavior while riding.
About
Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
lpfchan.github.io/Whimbrel/
Topics
bleimmobilizerninebot-g30nrf52840provisioningpwaweb-serial
Resources
Readme
Activity
Stars
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0 watching
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0 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
Whimbrel
Whimbrel is the companion web app of a three-part immobilizer system (Immogen — Uguisu fob + Guillemot receiver + Whimbrel) for the Ninebot Max G30. It serves two primary functions: flashing firmware updates directly from the browser, and handling the cryptographic generation and secure USB injection of a pre-shared AES-128-CCM key to pair the devices.
This repository contains the Whimbrel static web app. Note that shared protocol and cryptography logic lives in the Immogen monorepo (lib/, Guillemot/, Uguisu/).
Tech Stack
  • Frontend: Vanilla HTML / CSS / JavaScript
  • Cryptography: Web Crypto API for CSPRNG 128-bit key generation
  • Transport: Web Serial API via USB CDC
  • Hosting: GitHub Pages
Provisioning Protocol
Whimbrel uses the Web Serial API because it requires physical USB-C access, eliminating the risk of over-the-air pairing interception and conserving the fob's battery. Firmware exposes no serial commands to read the key back (write-only). Requires Chrome or Edge.
Serial Payload
Whimbrel sends a delimited string to the MCU at 115200 baud:
PROV:<128_BIT_HEX_KEY>:<8_HEX_COUNTER>:<CHECKSUM_HEX>\n
Example: PROV:4a2b9c8f...32chars...:00000000:a3f2\n
  • CHECKSUM_HEX is a 4-hex-character CRC-16-CCITT to detect transmission errors.
  • Device Responses: ACK:PROV_SUCCESS\n, ERR:MALFORMED\n, ERR:CHECKSUM\n, or ERR:STORAGE\n (storage write/verify failure).
Ephemeral Memory
The key only exists in the browser's RAM during the pairing session. Once the tab is closed, the key is gone forever. If a device breaks, a new key must be generated and flashed to both the surviving device and the replacement device.
Usage
Whimbrel is completely serverless and offline-capable. Once loaded in Chrome or Edge, it runs entirely in the browser.
Firmware Flashing
Whimbrel can fetch the latest firmware releases from GitHub and flash them via the Nordic Serial DFU protocol over Web Serial.
  1. Switch to the Firmware tab.
  2. Select either the Guillemot Receiver or Uguisu Fob. The app will automatically fetch the latest release version.
  3. Double-tap the reset button on your device to enter Bootloader mode.
  4. Click Flash Firmware, select the bootloader serial port, and wait for the flashing to complete.
Key Provisioning
  1. Generate Secret: Click "Generate New Secret" to create a random 16-byte hex string in RAM.
  2. Flash Uguisu: Plug the Uguisu fob into the PC via USB-C and click "Flash Key Fob". The browser prompts for the serial port.
  3. Flash Guillemot: Plug the Guillemot receiver into the PC via USB-C and click "Flash Receiver". Select its serial port.
  4. Completion: Both devices are synchronized with the same AES key and counter. The system is securely paired.
Safety & Legal
  • This is a prototype security/power-interrupt device. Use at your own risk.
  • Not affiliated with Segway-Ninebot.
  • Do not test “lock” behavior while riding.
About
Whimbrel — Ninebot G30 BLE Immobilizer Companion Web App
lpfchan.github.io/Whimbrel/
Topics
bleimmobilizerninebot-g30nrf52840provisioningpwaweb-serial
Resources
Readme
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages