Here are the version coding instructions. I've done this many times so I'm sure it works.

COMPLAINT: W211/ DISPLAY @ ICM READS “DIALOG FEHLER VERLASSEN MIT DISPLAY UP” WHEN TRYING TO VIEW FSS DATA.
THE INCORRECT CGW IS CODED IN ICM.
USING SDS GO INTO ICM > CONTROL UNIT ADAPTATIONS > VERSION CODING > CODING SPECIFIC FOR ICM > WORKSHOP MENU.
CHANGE THE SETTING TO “ CGW BEFORE MOD. YEAR 03”. FUSE #64 MUST BE REMOVED AND RE-INSTALLED TO RE-SET THE INSTRUMENT CLUSTER

As for the other problems with the car, it sounds like the rear SAM may be the problem.