Just purchased a used car with the x920bt already installed, and when I tried to connect my phone to it, it didnt work. After looking online and seeing what's up, it seems like some other people have a similar problem. What I'm experiencing is that: when I first turn on the headunit, for a few moments i cannot access the bluetooth settings (grayed out). After a while, it'll be available, and clicking into the bluetooth settings, everything would be grayed out. At first, it would say that bluetooth is on, only to then say it is off. The only thing that is not grayed out is the Firmware update, and clicking on that leads to a screen that says a blank firmware. Anyone know what's up?

Yea, you are definitely not alone on this one.  I can't delete any of the old phones off of the list and the list is full - so I cannot connect another phone.