Hi cadetdrivr I installed my 10.25 android screen in my 2015 GLK. However , I have been fiddling around to make AUX work/activate but in vain. I have activated AUX inside engineering mode as well but still not activating as you can see after selecting AUX from Audio menu , the AUX part is not selectable or highlighted. I wound be grateful if you can help me , I have surfed through all the remedies etc in MBWORLD and other online sources.