There is very little difference between the pre and post 09/2010 F10's with Professional Navigation - the hardware change is the introduction of the Combox, which added album art and better bluetooth functionality including audio streaming.
Quote:
"The USB socket in the glovebox is a feature of CIC - it is the service port used for music transfer and map updates. It was removed on cars with NBT."
All that would imply that software upgrade is possible on my car, it is just no one wants to do it? Why?
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This looks like a quote from me - the USB port in the glovebox was not for dealer level software updates, it was for transferring music to the hard drive and updating navigation map data. When the iDrive system was completely redesigned from September 2012, it was removed as the all-new system allows for both of these things to be done through the main USB port.
There is no software update which will enable the functionality you are seeking - it requires hardware - the Combox. You can retrofit the Combox, though - several places offer a Combox retrofit service. With the combox retrofitted, you'll gain your Bluetooth Streaming. You might also want to consider retrofitting the entire next-gen NBT system as it might not cost a huge amount more.