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I'm currently having the same issue as OP but I just got my OFT and just read my stock ecu on the tablet.
My tablet came without tunes from factory nor did they get saved automatically when I read my stock ecu.
So I used OFM to get the OTS tune files corresponding to my CaliD and when I try to load these tunes onto my car I get the same error message of mismatching ecu and then the other error right after too.
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