RNS310 phone button not working - firmware?

Hello can anybody help me how to activate the phone button on RNS310?
Currently is only mutes the radio. The bluetooth module works and shows phone on the white MFD but the radio phone button only mute function.
Do I need a firmware or some coding through vcds or any settings in secret developer mode?
Any help appretiated.

Have you selected 77 telephone when coding?

As I said the Bluetooth module is working. I can make calls and I see phone info on white MFD. But the phone button on the radio has only mute function - it doesn't show phonebook etc as the white MFD does.

I didnot write that for nothing. Read the manual.

When you have entered that code and it don't work, go to your dealer and ask for bleutooth premium carkit.
[Please Register or Login to download file]

The bluetooth is working fine! I can make calls I can stream A2DP just I do not see the phone on the radio - the phone button only mutes the sound instead showing phonebook etc.
Your link says that the SW version of the RNS310 must be at least SW0351. Mine SW version is just SW 0227, HW H15.
So anybody has the firmware update for RNS310 for SW0351 or higher?
Maybe the firmware is the same like for RNS315?
Thanks!

Can anybody post the firmware upgrade fro RNS310?

I have the same problem.