I have read a couple of posts on this subject and may have an answer for this problem. Note that this is for an 05 X5.

I read everything and was still unable to get perspective view on my new V31 update. The directions are to press MENU, go to SETTINGS and then press and hold MENU to get to the Service Mode. This did not work for me. I pressed MENU and nothing happened no matter how long I held it down and I could never get to the service menu.

It took a while to figure this out, but this is how I did finally get it.

Click SETTINGS and select SCREEN. Go to NAVIGATION and select. Go to ROUTE MAP and select. Select MAP POSITIONING and then select PERSPECTIVE.

I have no idea why this works, but it did. Hope it helps somebody.