i drive a 2008 335xi us model here in EU. When i first picked up the car, everything was working. In Holland, RTTI not working but when i would drive the car across the border into Germany, RTTI worked. After my first dealer visit, this was no longer the case and i have not been able to get it back working since.
The frequency issue was never resolved. However, i have met a ecu specialist who fixes these issues. he recently converted an x5 to receive all european frequencies. I'll continue to wok with him and see what we can do.
I'm surprised we have not yet found anyone in germany with allt he US military - there should be dealers who are converting these cars and servicing them?