I may have figured this error message out.... With my 12" display/enertainment system, I have two USB ports. On my selected inputs I have (AM, FM, XM, CD, USB1). During a 4 hour road trip 'Device not supported' started popping up again, after a few times I noticed the USB1 display icon was grey tone, and not activiting my jump drive. Removed /Replaced it a few times - no change, Swapped jump drive to USB2, and playlist worked just fine. SO, check your slections, see if there is something similar going on. Looks like a trip back to the dealer for radio #3.