BEFORE trying to load new OS, CONFIRM the currently loaded OS version.

Look in the top right corner of the Settings screen.
Current version for the Mk4 is 4-1/00 (means 4-1/100).

1) On a Mk4 you can load OS from CD or DVD.

2) Newer map discs have newer maps. If you want newer maps, get a newer disc. But the old one will still work. It just won't be so up to date. Just like a paper map 5 yrs old is not as up to date as a paper map from this year.

3) Burnt discs read slower than new discs, can make a big difference if your laser is old and tired. BMW recommend you use pressed (new) discs only.

4) Current map for Europe is 2009-02. It is available from BMW.