I have looked at that, but the laser works fine for reading the map discs - even copied one. It is only the upgrade discs that don't work.

In reply to another post, I've used Sony, Verbatim and a couple of other discs. Also used discs supplied by experienced members of this form (for which I'm very grateful). None of these work.

"all" I want is to put a genuine BMW disc into my system - and hopefully that will work...

I have a couple of guys from here now trying to source one from me, so thanks to all for their suggestions.