This is an old thread but I've just read it and if anyone is still having problems getting further than the screen where the USB stick is recognised the solution is to use a USB stick that is less than 1GB in size. Because finding one of those nowadays is pretty much impossible the easiest is to just create a partition of 512MB or so on any USB stick you have and put the files on this partition. The car will recognise both partitions and when selecting the one that is less than 1GB it will show its contents and let you import the files.
I have no idea why this is happening as I only encountered this problem after doing the last map upgrade a couple of months ago. I had never had a problem using bigger USB sticks until this time. And this only happens when adding POIs as I can still use bigger sticks for music and the car reads their contents without any issues. Weird.
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