I had a custom tune done at GSM on r16a. Now I want to upgrade to r20. I saved the custom tune and the original backup tune from Predator to PC. I noticed the tune number was the same as the original backup....Is this normal? I saved them to different directories (named original backup tune and custom tune). Will there be any issues with loading a custom tune done under r16a to r20? Now do I just: 1. Restore the original backup tune to the car. 2. Hook Predator to PC and update to r20. 2a. Will this update remove the custom tune from the Predator? 3. Hook Predator to car and let it update the new revision to the PCM... or is this step necessary? 4. Then do I just reload the custom tune from the Predator or 4a. Go back to PC and reload the custom tune to the Predator 4b. Then take the Predator back to the car and load the custom tune. By the way....where do I find the revision lsit, a list of what fixes or adders were done in each revision?
