needing some help still very new to hp tuners ! Just completed a 6.0l swap into my 1997 c1500 and also swapped in a 4l80 both came out of 2002 chevy 3500 I made my own harness and deleted the factory harness from the original 305. I tried to program the computer that came with the engine and not sure what happened all I tried to change was turning off rear o2 sensors deleted egr and turned off the security pats system and tried to rewrite file to ecm and now the ecm will not communicate so I went and got another ecm and hooked it up and this one will communicate again but I licenced my first ecm do I have to spend the credits again or is there a way to force a rewrite to my original ecm so I don't have to spend more credits ? any help would be great