Problem with retrofit rear cam and coding

Hello Guys iam new and sorry for my Bad english.
I see Here is all for Sync 3 but maybe anyone can help me for my problem with my Camera and sync2.

My car is mondeo mk5 from 2015 with sync2 with Front and rear pdc and also park assist.

Yesterday i hab’s retrofit a Rear cam and after that i have start forscan and Go into the apim and there is Rear camera and i can choice Rear camera Europa or Rear Camera north America .

When i Change this Settings and after that i make the shift to Drive back then few second comes nothing and then a Error Message with the Message . No camera availible. Maybe Someone can help how to get the picture from can into the Display. Thanks

My original as built was 7d0-01-01 0c6f 8592 339e