You could try this...from another froum that i got via a Google.. thanks to the original author! ..no liability accepted !!! Tuner area seems to be the one you need to change...

To access the service menu in the BMW Business CD:
- turn the radio off, then on again
- press and hold M for 10 seconds
- display will show SN#nnnnnnnn
- press +/- to access settings
- press 1-6 to change settings

SN - serial number
SV - software version
signal strength level
GAL - speed sensitive loudness
DSP - n/a
TP-V - traffic program volume (non-USA feature)
display check
tuner area selection
AF - alternative frequency (non-USA feature)