Renault Megan error on radio?

Hi, I have a renault Megan and the radio constantly says error. We have tried leaving the radio on and disconnected the battery etc but the display still says error, it just won't go, we can't even put any numbers in, also we need the correct code as the ones we have I think are wrong, many thanks for whoever can answer this headache,

Model 22dc277/62
Toz 270
Rn 277f20054567
Prod no fd0002470054567