When it comes to uploading via USB you have to modify the files i believe to use 1 stick otherwise you have to use 2 separate sticks, there is a topic on GPS Underground otherwise ask Sergev.
You need the FSC code no matter what when updating the maps regardless of version, you supply him with you vin number and let him know that you are updating to i:e 2013, the code he generates is bespoke to your vehicle and map version so unfortunately every time a new map is released you need a new code
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