My 06 A8L has MMI 2G which has a hidden menu that can be enabled through VCDS (Ross-tech software). This is how I did mine. ****Control Head -7 —>Adaptation-10—>Channel 8 – 1—>Reset MMI = Tel+Big Knob+Upper Right Button altogether. To access Hidden Menu: Setup + CAR together hold until the hidden menu appears.
How to enable battery level meter after software update – A8 D3.