TheFlashBold/simos12-to-simos18-conversion

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 SAP/EVAP patches for European vehicles and Pi 5 workarounds for bri3d's TC1791_CAN_BSL toolchain.