Last night I uploaded GDP tunes to my 20 L5P and it went great, everything said it was happy. Unplugged the unlock cable and the truck will not even attempt to start. I tried to get back in and write the stick files to the ECM and it has me locked out. HP tunes software will not even see the ecm. Any pointers on what to do while I wait till Tuesday for everyone to open back up from memorial day?
Life lesson... DO NOT TUNE ON FRIDAY NIGHTS!!!