Quote Originally Posted by Eggman View Post
I'm pretty sure ETACS verifies certain information from the ECU, such as VIN and odometer value. Since it checks those values, I wouldn't be surprised if ETACS also checks firmware version and checksum.
Vin and odometer value's would be some data other modules look for, so those generally need to be correct(but not always depending on car.) As for firmware and software version, I can't speak to mitsubishi, but vw's modules don't care what software version anything is at as long as they get the values they're expecting when they ask for it. And as far as checksum, as long as you don't screw up your bin file or your flash process, checksum should be fine. All of that stuff is handled by your flash software, either your factory scantool or in the case of this discussion, Pcm Flash sounds like it has the most promise.