So all you need is an update disk in the CD changer and it will reload. Do a search for MMI 5570 updates on google and download disk 1, burn it to a CD and put it in the 1st slot of the CD changer. When your MMI restarts it should read the disk and reload the MMI." The core OS for the MMI is QNX, FWIW. Mike, This sounds like a MMI control unit issue or radio amplifier issue. The MUTE icon will permanently come up if there is a problem with the sound system. In rare cases, we have seen issues with an MMI button stuck down causing "slow" reaction of MMI menu function or permanent muting of the audio system. First check the operation of all the Important: If the radio clock is not set in the adaption, the "Radio clock"option is not shown on the MMI menu (A4,A5,A6,Q5,Q7,A8) or onboard computer menu (A3,TT,R8) as appropriate. The time runs in normal clock mode. Audio over Bluetooth stopped working. Just the other day I went to play a song from the Youtube app (nursery songs for the kiddo) via bluetooth and the audio won't work. When I turn up the volume the MMI screen says audio unavailable. I have successfully been able to listen to Youtube via bluetooth since I owned the car (2017 model). A6 / S6 (C6 Platform) Discussion - 2007 Audi a6 MMI not working after dead battery - Hello so my father went on vacation for a couple of months and his a6 been sitting so I decided to start it up and the battery was dead and the key got stuck in the ignition. Before you contact your Dealer, you might try these two things, if you have not already: 1) MMI reboot. Start up the car and get to your MMI loading page. Push and hold the Volume knob at the side of the center console until the MMI reboots. See what comes up! 2)Do a "full shutdown" of the car: With the car on, roll up all the windows. You probbably have to change the microphones in the roof - depending on the configuration of MMI in your car you might have 1, 2, 3 or 4 microphones in the lamp module in the roof - i am guessing that you only have 1 microphone (for GALA). You need at least 2 for the handsfree to work. 2005 A2 1,6 FSI S-Line. A6 / S6 (C6 Platform) Discussion - 2008 Audi A6 MMI not working - Hello. I have a problem with MMI 2G that I'm trying to solve for about a month now. It was working fine until it it just turned off (it was raining these days). When I press the volume button (mute), MMI screen comes on and then it says: Note: An Not used : 25: 30A: Digital sound package control unit Information display control unit Radio (20A also used) 26: 5A: Fuel tank leakage control unit: 27: Not used : 28: 15A: Engine mount control unit Reductant control unit Or Reductant control unit or not used: 29: Not used : 30: Not used : 31: 7,5A: Radio: 32: A: Multimedia control unit 2012 Audi a6 3.0 Replaced the sensor up front that wasn't buzzing. The camera came back on for about 30 seconds and now wont turn on when in reverse. I purchased the back up horn that I believe is located in the front not the back like previous year cars. Does anyone know how to replace this or any other options on fixing the issue. Thanks! v8F2.