Ok, I read through quite a few predator threads. Sorry if this is posted already, but I can't stand to read any further. Has anyone had a problem restoring their original tune. I loaded the High performance pulley tune 2 years ago and hadn't touched the PCM or Predator since. I took my truck into the Ford Dealer to recal the speedo and they said they can't do it because the PCM is coming up blank. I took in the Predator to see if it was the problem and tried to load the original back in. I get an error that it is unable to load because something about the license does not match the previous tune loaded. I just sent an email to diablo, but I figured I would see if anyone here had any experience with this problem. I bought the tuner brand spanking new and followed the instructions to a "T" when I installed the High Performance tune.