From what I understand in order to reprogram an ECU/PCM you need the MaxiFlash Pro (which comes with the pro version of the Maxisys) and a laptop connected to the MaxiFlash Pro running software from the car manufacturer. Of course this software comes at a price to access it. One other thing to keep in mind is that the MaxiFlash has not been approved and confirmed fully functional by any car manufacturer so you program at your own risk. Haven't done it myself so for all I know it could be the best tool for the job, who knows! Good Luck.