[Solved] Blaupunkt RD4 n1 - Radio citroen c4, the display does not respond

Hello.
I recently bought the car mentioned in the title. Everything is nice, but the display does not work. After removing the radio, only one composite cube and the antenna are connected. The radio works, of course, it plays very nicely, but you can't tune in neither the sound nor the station properly, because it doesn't display. Does a separate cable go to the display? Perhaps someone has replaced the radio with one that does not support this type of display. If anyone could tell me if the connection is ok, I'd be grateful. I don't see any loose plug. I will add that the rest of the functions work as they should. The computer shows combustion and other functions.

And does selecting functions from these four middle buttons work? Pinout of the RD4 Citroen radio cube in the attachment. The radio looks original, but is it connected to the system in the car?

The note button works, when I press and move darkly, the sound changes. Others don't seem to work, when I press it, nothing happens. The radio is factory, the only question is whether the previous owner changed or pulled it out, because there are traces of unprofessional disassembly on the frame. Okay, I'll take a look at that schematic right now.

The display has an uncoded radio function.
LEXIA and 10 minutes of work.

I don't have Lexia, can you do this for me? If so, how much? I could drive up. I understand that the connection is ok? It's like someone has been digging before and you don't know what they were doing.

You can also rewrite the eeprom in the display and enable radio support, but I recommend Lexia as Szymon wrote.

Ok thank you, everything goes through CAN, tomorrow I'm going to Lexia and after the problem.

Lexia helped.