I recently bought a 2010 A4 B8 2 litre diesel with a few slight issues, options list says it has navi low, however it won't accept the disk i.e. doesn't 'suck' it in and when I select navi it says insert disc.

So I bought vcds (genuine item) from Gendan, when I connect to car it says navi module not installed, any ideas vcds gurus?