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In the video I will show you how to enter the hidden menu of the RNS-E Audi navigation plus. Generally, this is a service mode for diagnosing faults in our navigation, and it offers additional settings such as an equalizer in which we can improve the sound quality because it has additional functions in addition to those in the normal menu. In addition, we can check the current speed of the vehicle, the operation of the radio and GPS, there is diagnostic data of the FM tuner, etc.