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You were lucky to revive it:
There are two types of control units that cannot be programmed with WinKFP: CAS and ECU (I can say for sure for the M3). Both are protected by electronic signatures that cannot be provided by WinKFP, only with ISTA.
Alas, WinKFP first clears the programming without a hitch, but gives an error when it tries to program the new file into the unit. Essentially, it is dead afterwards and can only be revived with better equipment.
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