I have issue with screen in my citroen c4 2009, after i change radio unit from RT4 (model no. in photo), to RNEG1, something happend like in the picture, even after in diagbox entering my vin to new radio, i havent seen some option to change the display option etc.
Radio is succesfull conected with car, it shows the diagnostic, button from steering wheel working but only what is wrong, is that screen
All I know is that, I propably have high resolution screen that which Rneg doesnt work with, and that the reason why is work like that
Have somebody any idea is it possible to repair it without change the screen or what's wrong is with that ?
And the last thing is i don'g check the model of screen so i'm not sure which resoultion i already have
Thank you in advance for all
