Hello, I experience problems with my F9220BT.
I cannot connect any Phone to my carsystem. Everything worked like a charm for almost a year.
I went into the Bleutooth settings and saw that every menuitem was grayed out. I cannot select them.
The only button taht works is the Firmware upgrade button.
If I click his button it shows current Firmware version: :
There is no version number and it looks like the unit lost it's firmware.
I did a factory reset of the unit but this was not succesfull. I tried to install firmware of the entire system but once copied on a SD card the upgrade does no
