1. Flash any tune with the Diablo tool to get the device to try to save the Backup tune

2. It should tell you the PCM has been tuned before and to go download an Update

3. Go to your PC and use Diablo’s updater app Update Agent to download the needed files specific to your PCM to flash it back to stock

4. Immediately go back to the car and the Diablo will AUTOMATICALLY install the update that will Flash your PCM back to Stock

5. Your PCM should now be ready to accept a tune. Repeat Step #1 and see if you’re successful

6. IF THE PROCESS IS INTERRUPTED OR UNSUCCESSFUL, Repeat Step #1 through #4 as many times as needed