The actual OBC is on the cluster. The screen is just a display and user interface. So are you able to choose option on the screen but they are still not showing correctly on the cluster? Also if you have verified that the stalk BC button works but nothing happens on the cluster there is something wrong with cluster itself. Have you tried reset on the cluster hidden menu?

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E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
E70 X5 40d -12 M-Sport Space grey