Some of us enjoy reading a good man versus machine detective story.
This is a long description of the process of getting access to the software running the head unit (audio, navigation, etc.) in his car.
Back in June, I purchased a new car: the 2018 Subaru Crosstrek. This vehicle has an interesting head unit that's locked down and running a proprietary, non-Android operating system. Let's root it. If this was Android, we could most likely find plenty of pre-existing PoCs and gain root rather trivially as most vehicle manufacturers never seem to update Android. Because this isn't an old Android version, we'll have to put a little more work in than usual.