I've already submitting a support ticket with HPT, but really need to get started on this car...
I was told that this vehicle has been previously tuned by a local shop, and the PCM was unlocked through HPT/tuned with HPT. I get this validate checksum failed error when I try to download the file from the PCM, and the file that downloads is blank. It shows another error that says something like "you will be unable to save or modify this file, submit this file with a vcm suite infolog to hptuners"
Anybody run into this? What was the fix?