I've tried 2 USB sticks in my '10 2SS, a 16gb Duracell & a 4gb Cruzer, & neither work. When I insert it, it'll start playing the first song while it indexes the songs, but then it says that there are no supported files & switches to the CD. If I leave it in, after a while it will automatically switch to the USB input & restart indexing, but then the same thing happens. It will keep doing this until I unplug the stick.
I don't know if this will fix it, but my car's due for it's first service on the 22nd, so I'll print out the service bulletin & bring it in.
From reading this, this isn't just a software update, but a replacement of the PDIM module, correct?