I don't have one installed but when I boot up it immediately tells me that images may be reversed and a blank screen. How can I disable my rearview camera in test mode because I can't get to the menu.

i would check to make sure that your reverse wire was not pinched and is being grounded out making the unit think that the car is in reverse all the time

Went to the pioneer website, got the free firmware update, put it on an sd card, works like a charm. Firmware update deletes all your files and replaces them so I guess something was corrupted.