How Do I Reset the Audi A4's MMI?

I recently purchased a used Audi A4 and the MMI system seems to be malfunctioning. How can I reset it to its factory settings?

To reset the MMI on an Audi A4, you will need to press and hold the CAR and SETUP buttons simultaneously for 10 seconds. This will reboot the system and restore it to its factory settings.

I had a similar issue with my Audi A4 and found that disconnecting the car's battery for a few minutes and then reconnecting it also reset the MMI system.

If the MMI continues to malfunction after resetting it, you may need to take it to a certified Audi mechanic for further diagnosis and repair.