I have 2004' x5, just opdated Nav os about a month ago, looks great! But, I have a 6 disc in the back and when I switch to the mode for cd on the nav, it says "no cds." Could this because of the update?

I brought it in to Bmw of Sarasota, who is terrible by the way. They said I have to replace the whole unit!!!

I thought it had to do with the update, since the problem occured right afterwards.

Any suggestions,

Big thanks, David