How do I access the hidden menu on the Audi A8 head unit?

I've heard that there are additional features and settings available in the hidden menu on the Audi A8 head unit. How do I access this menu and what can I do with it?

To access the hidden menu on the Audi A8 head unit, turn the car on and press and hold the CAR and SETUP buttons for 5 seconds. This will bring up a new menu with various options such as software updates and background lighting customization.

I've found that accessing the hidden menu on the Audi A8 head unit can be useful for fixing issues with the navigation system or troubleshooting any other technical problems. It's also a great way to personalize and customize your car's features.