Yes, you can (try to) Jailbreak your Tesla, or just send a request to the Service Center for getting a previous version?First you hack the OS so that it will run unsigned code. Then you obtain the previous firmware and spoof the version to something higher than what is installed so that it passes the OS's version check. Then you introduce the update through the hacked method that you developed and voila, firmware downgrade. Then you call up Elon and tell him how you managed this hack and he'll probably reward you handsomely. Or he'll just cut your car off from all official Tesla support. I guess it depends on what kind of mood he's in.
I have lost all mobile connectivity, since updating, and I've rebooted twice.
I might have done that, accidentally. It started working, after a couple days/I left it connected to wifi as much as possible/left my phone in the car, with hotspot. (Cannot connect the car to a hotspot, while its driving, BTW.) By "no connectivity" I meant "no connectivity" - I had to put my phone in, and connect the car to my hotspot to be able to book a service appointment - very odd. No maps, no streaming, no connection to the app, etc.Did you try the hard reset with the brake pedal pushed down?