Avic F90BT by Pioneer

I have installed a rear camera and it works just fine when I back up, the problem is that it freezes the Avic-F90BT. Radio works (if it was on when I turned the engine on). The display stays black and says "image can appear reversed" or som'n like that. Menu and Map buttons aren't working at all. Reboot works sometimes and when it work everything is back to normal (I actually noticed delays since I have the camera installed). OS has been updated recently, didn't update the bluetooth I thought I didn't need to. Any help, suggestions? I will unplug it soon cause I need the map service more than

You are right, it shouldn't be enabled if you don't have a camera. My problem is that I have the rear camera, it works just fine when I back up but it freezes the Avic-F90BT. Music works and I can change the songs with the volume button. But nothing else, blank screen (it actually says image can be reverse or som'n like that) and menu and map buttons are dead (backlight works). If I am lucky enough to reboot it with no freeze everything works fine. Any help, suggestions? I need the map more than the camera, i thought to unplug it but I want to give it another chance It's a cool gadget if it