I gave it a go.... managed to get the hidden OBC service menu to display by pressing the OBC message selector (not trip reset) + switch key position 1. However, I was unable to unlock menu 19 to display menu 3 to 18.

But when I tried Trip Reset + Switch key position 1, I got the following:

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Here's the Photo Album of my (sold) X3; Album of my (newish) X5 is on the way!
(WARNING: read this before you buy anything from Umnitza)