Ok AVT boxes had to be setup to match DHP software. Kind of like a password checksum or some such crap. Thus making AVT sold boxes in operative with DHP software unless configured as such. Guy who ran DHP has said not to do it anymore. I he doesn't have permission to make new boxes just repair old ones. I'm sure if tech savvy person out there had two side by side it would be easy but possibly not exactly legal. And considering the software is barely supported/accessible, who should care, as the serviceability of working on these cars is waning as numbers dwindle. I picked up used serial box and am hoping for some luck. But repair is only $40+shipping. So I am hopeful mine is good to go. Someone somewhere was familiar with drones or rc stuff and figured out how to add usb to a serial box. But good luck to all who venture forth.
