2012 3500 dually came with minimaxx tuner.. I have tried to load mcc tunes on it but can’t get it loaded..they sent me so card so all I was to do is put it into the tuner and follow direction.. I never got by the 2nd step that ask which tune to load from sd card to truck.. it says corrupt file ..person I got the tune from says maybe internal error with Mini Maxx anyone else have this problem