thank you for fb !It is possible to install EU firmware over NA firmware. Some features might not work properly/are not shown anymore like the US based Sirius XM radio. And if you import a car, the radio stations are not working correctly - therefore you have to change the TAU module (tuner and amplifier unit/hardware) to one of your region.
thank you for answer.
@AnClar have you check/heard of YT? It can be unlocked install tweaks, and do whatever you want. The solution is not published to the public unfortunately.Fw70.00.367 and newer, the software has been locked down to the point where it can no longer be configured to allow any tweaking (serial or USB). At least no one has been able to figure out how to do it yet.