Well folks, if someone can solve this i'll be very impressed and grateful as i've been on lots of forums, called dealers up and down the country. Nothing. Not a squidgen of help.

I have a RNS-D (cd based) Audi system. Been using 04/05 discs on it. They are DX travel pilot discs. No problems.

Recently upgraded to 07/08 discs which are compatible with this system. Message says 'CD not compatible. Please insert Travel Pilot DX cd.'

Totally baffled. Have read about firmware upgrades e.t.c Through hidden menus i have software stamped August 09 2001.

How do i solve this real headache?

Thanks for your help
Andrew