If it helps :
I spec'd my F10 520d M Sport saloon from scratch - 60 reg. October 2010 build.
The USB music interface was a paid for option at the time (shortly thereafter ... early 2011, it became standard ... albeit with a price hike too) :
USB interface 6FL £205.00
I have no nav. system at all.
The USB port is in the centre console.
Have you checked the VIN for option 6FL?
What size USB stick are you using?
Have you tried >1 USB stick?
Cheers
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