Simos 12.1 to Simos 18.1 ECU swap guide for Audi A3 8V EA888 Gen3 1.8 TFSI CJSA. Covers bench read, boot password extraction, and immo-off flashing using Raspberry Pi 5 + ESP32. Includes Pi 5 workarounds for bri3d's TC1791_CAN_BSL toolchain.
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Updated
Mar 27, 2026