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I also got couple of months ago first drivetrain error and RBS faulty messages with "cant restart engine after shut down". Gladly message went of everytime I restart car again. Couple of weeks ago message start come almost everytime I drove, so took it to BMW. They change "REM" wiring (regenerative braking wiring) and update software after that. whole cost was less than 1000€. Part cost 70€ and rest was coding, faulty finding, software, etc etc and 2h real work.
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