X710BT with F700BT/F170BT firmware 4.001000 FM problems

Hello

I have some trouble with my X710BT radio, Iam living in germany and i want to use the X710BT with german language / Navi and FM frequencys.

After some investigation here in the forum and the internet iam able to reflash my radio with firmware 4.001000

Now my radio is runnning with Firmware 4.001000 and Germany language and everythink looks ok, beside the FM frequency:

my radio only scan / work in FM frequency range from, 87.5MHz to 92.5MHz !

So my question is, how can in expand the FM frequency to the "normal" FM frequency range ?

Did someone has i idea, or is there anyone with similar issues.

I have open also one issue in the X-Series forum because i dont know if this is a F-Serie issue or X-Series issue !

please help !

thx