How do I reset the Audi A4 MMI system?

I accidentally messed up my Audi A4 MMI system and now it's not working properly. What steps do I need to follow to reset it?

First, try rebooting your MMI system by pressing and holding the MENU and CAR buttons together for 5 seconds. If that doesn't work, try disconnecting the car battery for a few minutes and then reconnecting it.

Another option is to use the MMI hidden menu. Press and hold down the MENU button for 5 seconds, then press the settings button on the control panel. On the hidden menu, select 'car', then 'restart MMI'

If none of the above methods work, you may need to take your car to a qualified mechanic or dealership for further assistance.