Skoda DX /VW MFD-1 automatic reverse camera switching

Have any of you jumped into the rabbit hole of connecting a reverse camera to a DX unit or an MFD-1? 

I know that there is a 'video on' pin (7) at the round DIN connector, and depending on which head unit you have and its firmware, if 12v is applied to it, the screen will switch to the aux video input, giving you a fully functional reverse camera.

I have gone this route, and bought this quite pricey adapter: https://www.carfeature.de/en/hifi-navigation/cameras/...alle-kameras/21323/caraudio-systems-rl-mfd1-rgb-converter-fuer-rueckfahrkamera-mfd1/navi to convert a modern video signal from a reverse camera, to whatever the MFD1/DX uses.

I plugged in and it works but only if i manually switch to the aux video in input. I have tried feeding the head unit 12v to pin 7 and it doesn't automatically switch. 

I contacted manufacturers tech support, and they said that this pin is activated only in some versions of the firmware, and the firmware is of course different across the Skoda, Vw, Audi, Seat and Ford variants of the head unit.

Has anyone come across this before and has any extra info? I have managed to find youtube videos of people getting this to work and switch automatically when the car is put in reverse but only on the VW units... 

Edited 26 October, 20241 yr by WelshSkoda93