the maps are to be updated using a DVD, not a usb stick.
Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.
Am aware of dvd route, but USB should work, updates are supplied via this route. Also what about UK post code, will this work with map upgrade i.e. to 2014 maps, or will it need a dealer code upgrade too?
BMW UK head office / customer service is the only source for postcode update info, there is no way for me to know more than they know.
as your updates are presently not working via usb, I would suggest you try via dvd instead.