The problem with the various above suggestions of delayed update is security patches.
There are already instances of security holes being attacked very shortly after the patch is released, by people who have reverse-engineered the patch to find the hole.
If you delay updating for several days to avoid any chance of bricking the car, you might find that it's been hacked. Which for a car might have very nasty consequences - the people doing the hacking are unlikely to do extensive safety testing!
Biting the hand that feeds IT
