Download firmware and extract it to desktop of your computer.
Copy all contents into SD card's or USB flash memories root folder. (not in a folder or archive. All files and folders must be readable in root directory)
Put SD card into infotainment system's SD1 slot or USB flash memory to car's USB port.
If you have MIB2, MIB2.5, VW, Seat or Skoda MIB3 Press and hold menu button. Select system update. (Do not run system update directly from settings menu)
If you have Audi MIB3 tap and hold with your two finger on top right corner of screen. Unit will be restarted in update mode. Go to system update menu there.
Click start and update will be started.
Once completed click "done" icon. System will be restarted.