I was able to save my 12v by disconnecting the terminals doing a hard boot. Letting it sit off for a couple of seconds, then reconnecting the 12v terminals. After the Hard Reboot, the battery 12v battery started charging and I can now enter service mode again. Not a very good solution. In 5 years, that is the first time I have had that issue after an update. I did the update in a metal hangar with no Cellular data, I wonder if that had anything to do with it.