Radio does not work after battery change

[LABALAI]

Dear all,

I replaced the battery of my 2006 X5 4.8is for a new one, between the change it passed more than 12 hours, because first I removed the old battery and dropped it at the dealer, and then I bought a new one. Once I installed the new battery and turn on the ignition, I setted the hour and date in the onboard display, and I noticed that all the Menu Options are there except for the DSP menu option. Inmediatetly I tried to turn on the radio pushing the left dial but the orange/yellow square light near to the left dial did not turn on, so no radio at all. All the others things works fine: TV, etc etc, but no sound at all for TV and no radio (no DSP menu), also no sound for my telephone, it is completetly mute the X5. I heard that after changing the battery I could loose the radio, so how I can get my radio working again? Should I go to a dealer to fix this? Could I solve it for myself?

Any help will be appreciated it.

Thanks and Regards.