RCZ NG4 replacement

I recently purchased an RCZ which had an aftermarket touchscreen android headunit installed by the previous owner. Car has a flip up monitor which doesn't work with the aftermarket stereo so I obtained an NG4 stereo from a 308 convertible to work with the flip up screen.
When I installed the NG4 stereo into my rcz the screen popped up and the stereo started beeping with a message on the screen "connecting to sim card" or something like that.
Somehow the beeping has stopped and sound does comes through the speakers when I press radio or insert a dvd but there's no display even though the screen is on. Screen is not dead because when I press the red phone button it displays (in French) the option "yes" or "no" to make a call and when I press "oui" as in yes the screen goes blank again. Also when I try to connect via Bluetooth to my phone a message comes up (again in French) requesting to connect to my phone. When I press yes the screen goes blank. The screen is on but no display even though the radio and dvd player can still be heard through the speakers.
I then took out the stereo and connected it back to the donor car and it worked fine pop up screen and display worked with no issue.
Do I need to remove the flip up unit from the donor car as well in order for it to work in my RCZ? or do I need a software or firmware update.
Any ideas or advice will be greatly appreciated.

Units need vin coding. The NG4 died in mine too, I fitted and coded one from a 5008.

RCZIain said:

Units need vin coding. The NG4 died in mine too, I fitted and coded one from a 5008.

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Thanks for your reply. However when you fitted yours did it have no display on the screen like mine before you coded it? Also how much did it cost you to code it?
Apologies for all the questions.

I don't know I never tried it before coding.
Didn't cost anything, I had diagbox until very recently.