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F30 320d 8HP
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No, I didn't have a PSU on it, I just had the engine running. Was that the mistake that made it worse?
Shawn already posted a line from the logs you sent where it says that BDC_BODY2 flashing did not start as it did not meet the precondition "engine speed not null", aka engine should not be running when flashing BDC.
So yes, in order to flash the BDC you need to have the engine off (and a proper PSU, unless you want to be in a world of pain).
 
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