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When we are connecting the external AUX device (for example, when you are installing our Carplay interface for Mercedes NTG4.5/4.7) to Mercedes cars with NTG4.5/4.7 system, such as GLK, C Class W204, E Class W212/E Coupe C207, ML, GL, CLS, etc, we need to choose AUX source in the menu, for some cars, the AUX menu already activated by default, for some other cars, it is not. In this case, we need to activate the AUX menu, otherwise the system will not play the sound for the external device