Comand APS - How to unlock...

I need your help....I have a new Mercedes with DVD comander APS (version 4.1) and I want to unlock it because when I drive is not possible (for security) to watch videos...and of course the image disappears...
What about this secret menu: select radio and in the same time 1 - 3 - mute for 8 seconds... and a tecnical menu appears...
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