How can I access the hidden menu of my Audi A8?

I'm trying to access the hidden menu on my Audi A8's MMI system, but I can't seem to figure it out. Is there a specific button combination or sequence that I need to follow? Any help would be appreciated.

To access the hidden menu on your Audi A8, you will need to simultaneously press the CAR and MENU buttons on your MMI system for about 5-10 seconds. This will bring up the hidden menu, which you can navigate using the MMI knob.

I had the same issue with my Audi A8, and the trick is to hold down the CAR and NAV buttons until the hidden menu appears. From there, you can find all sorts of interesting information and settings.