How do I reset the MMI system on an Audi A8?

I have a 2018 Audi A8 and the MMI system has frozen. It is not responding to any commands. How do I reset it to factory settings?

To reset the MMI system on your Audi A8, press and hold the Menu, Navigation, and Back buttons simultaneously for 10 seconds. This will reset the system to its default settings. If the issue persists, try disconnecting the battery for 10 minutes and then reconnecting it.

I had the same issue with my A8 and found that performing a hard reset by disconnecting the car's battery for 10 minutes resolved the problem. This may be a more effective solution than using the buttons on the MMI system.