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Experienced tuners note that error 121 appears more frequently on specific ECU families due to their bootloader timings:
The most critical aspect of this update is the aggressive expansion into and Module 89 (MG1 ECUs) , reflecting the industry's shift toward Chinese-manufactured drivetrains.
Introduced support for MED17.9.9 ECUs used in the 2.0L gasoline Ingenium engine series (Jaguar XE/F).