The Navigation forum here on Xoutpost is one of the go to forums for Nav OS/firmware upgrade for MANY other BMW forums. Many BMW forums will link you to a couple of the threads in the forum here.

Click the link at the top of the page for BMW SAV FORUMS, then scroll down to the NAVIGATION FORUM. There are MULTIPLE threads in that forum that will have links that will allow you to download and burn a V31/V32 disc that will update your Nav's operating system...as well as explains what each version ("V_ _") adds or takes away to the Nav set-up (MK I/MK II/ MK III/MK IV) you have installed in your vehicle.

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