I'll keep this clear and concise.
Bought a D5163Z with a backup camera, the touchscreen switched to the camera when I put the car in reverse. Camera function was perfect but the unit itself was a piece of crap running WinCE so I sent it back to Eonon and got the GA5163 as a replacement. It's an Android unit so it's much faster, stable, and customizable. Unfortunately, the backup camera is not being triggered anymore. Didn't work with the stock firmware, so I flashed to a custom ROM and it still won't work which leads me to believe it's not a software issue. The reverse switch function is built-in if I'm not mistaken and I've tried connecting the cam input cable into every possible video port in the unit.
Anyone dealt with something like this before?