It's been a while since I've messed around with EFI since I sold my truck. I am trying to edit a transmission tune for one of my friends with a 2001 LB7, with the 5 speed allison. When I read the current tuning file from the TCM with EFI version V8 it saves the file as a .ctz file. I open it and click "Edit with EFI V7.5" but when it opens the file in EFILive Tune V7.5 all information is blank, I cannot edit anything. What am I doing wrong? Do I need to read the TCM file from the truck with V7.5? I got some kind of error message when I tried to do that, I don't remember what it was.
