Not sure anyone has raised this issue, so I'm wondering how people feel -

I'm not Microsoft fan, but reading about all the difficulties with loading Nav software makes it apparent that BMW is way behind the curve when it comes to software upgrades. The upgrade should be at least a 2 step process once the upgrade CD is inserted. The upgrades should have checksums that verify first whether ALL of the new code has been read properly off of the CD. Only then should the actual upgrade begin and at that point it should happen correctly unless power is turned off.

So the result should be that you insert the CD, and either you end up with a new properly functioning upgrade, or you get a screen that says upgrade was not performed due to data error (but you still have your old version working the same as it always did). No in-between black or white screens or performance problems

If MS was this bad at upgrades, there would be millions of people with dead computers every month when a new windows security update came out.

Fortunately MS doesn't design cars because we know those wouldn't work, but unfortunately BMW doesn't know how do design software, or at least software upgrades. JMO