Just finished my upgrade as well. I followed DrMcCo's approach and it worked flawlessly, once I had the right USB stick (my first one had a bad sector and would stop the copy of the files at around 16GB!). Further to the USB used, I bought a V3.0 with a read/write speed of 70/50, this uploaded the maps into the car in about 30 minutes. Sat and listened to Sirius Radio to pass the time. I also want to thank JwZimm for his torrent, couldn't have done it without you!! I am seeding now for payback!! I can now navigate right to my garage, before there was no street.
Got the FSC from Sergej as well, man he was quick, 10 minutes!! Good man to deal with if you require his specific service!