Guess what?!! I am in the same boat as you! I bought a BRAND NEW Cobb AccessPort from a highly reputable vendor here last fall.
The Access port detected that my ECU is I8A0S, but in actuality this is what the BAV tool is detecting:
I've been running the wrong ECU firmware from day one! I've been having constant driveability issues with Cobb, weird stuff happening to my car like the radiator fan turning on randomly, and most recently a series of seemingly incurable misfires.
Needless to say I am very pissed about this. I'll be sending all of this feedback to Cobb.