I have flashed GMs, Fords, Chryslers, and a Volvo all with the manufacturers websites. I'm wondering what else everyone has tried and been successful and what hasn't worked? Also I have read that some people are able to flash GM vehicles with the Maxisys itself without buying a subscription to acdelcotds.com I have never been able to get it to work am I doing something wrong? I always comes up with a message that says "please use the USB cable to connect MaxiflashPro to MaxiSYS" and "make sure MaxiSYS is Connected to the internet before connection."