I don't know myself how to do it, but you might need the PDIM module itself disconnected from its power source, and then discharge any current left in it. You might also want to try grounding the USB connection to discharge any static buildup that may have occurred. I think a fuse pull would achieve mostly the same thing, but this would probably be your next recourse.
Still legal in 16 states. It's happy. It's fun. It's Happy Fun Car.
Do not taunt Happy Fun Car.