I got my reversing camera to work on the media nav. But its not for the faint hearted.
You have to revert your firmware to 4.03 to allow access to the micon panel. Once there you can allow the camera BUT, this action puts a fault on the satnav software which will no longer work. So you then have to download and reinstall part of the medianav software to fix the sat nav.
Look in the Stepway electrical forum for a thread about media nav speakers started by by amoggy I think. That was the thread that started me off.
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