I just purchased a used V1 setup with 3 licenses, I also downloaded and installed the latest verion of the software and when I tried to read the calibration and I get a bootloader rejected error message saying the pcm could not be unlocked. A while back I got a mail order tune using HPtuners but I contacted the tuners and they said that they don't lock their pcm's. I just want to make sure that I'm not doing something wrong before I go looking for a new pcm. I installed the software, hooked up the the cables to my truck, the flashscan interface, and to my laptop, opened the tune tool, turned the ignition on, clicked on read calibration data from pcm, selected Gen III LS1 99-08 PCM (I have an 01 Sierra 5.3), clicked check status (status was ok), clicked start and then I get the bootloader rejected error message. Can somone help me figure out whats going on?? THANKS!!