Tunning a buddies truck. I tried reading the stock programming and it came up with a locked pcm error. Tried it again and it read just fine. Built the tune for it and when ahead and licensed his vin to my flashscan. When I go to load the modified tune to his truck it reads the normal attempting to unlock ecm 1 of 4 etc. Well it goes thru all for time and during some of the it pops up something to the effect that it failed the attempt and will try in 1 sec. It says this numerous times then throws and error that will say either something about the bootloader or cannot comunicate with ecm? Any ideas?