After successfully upgrading my Nav firmware from its original V26 (4-1/60) to V32 (4-1/00) (thanks to the links for burning a DVD in the Nav forum)...found & purchased 2012 BMW Nav DVD set (east & west) for $30 on ebay.
BTW...love the "perspective" view with the horizon off in the background...I find it very interesting...but it doesn't display street names like in the other views. Does this change with updated maps? Guess I'll see soon when my 2012 map DVDs arrive.