Re: And again.
I had a garage (main dealer, so not some back-alley bloke who'd probably know better than to mess with it) fluff a firmware upgrade to my car's ECU, bricking the damn thing and leaving me without transport for three days, so not having wireless connectivity is no guarantee of safety.
The fun part was trying to stop them explaining what firmware was and what updates were, and trying to get them to explain exactly what their update was supposed to do anyway.