

Signed software does not equal blackbox. You can still verify that the software in the vehicle is the same as the provided one (download the software from the vehicle and compare checksums for example).
Again, there must be software parts that must pass homologation to be allowed to run on public roads. The same is true for a lot of things, your laptop for example has lots of firmware blocks that you are not allowed to change because of regulations (emc and emi for example).
And that is a good thing. Trust me, you don’t want untested software on the street, risking lives. That’s why vehicle testing is done first on closed roads.





I heard you need to exclude Android auto in the WireGuard settings, then it should work.
The reason is that the car communicates via IP with your phone. But when all phone traffic is routed through your home, it can not reach the car.