Ok, my owner's manual says our radios can read a maximum number of 65,000 files per device, with a max number of 999 folders per device (usb thumb drive) but I still can't figure out how to switch between folders. Can anyone else switch between their folders on their thumb drives?

 

Its pretty lame interface as selection is press by press one folder at a time but once you click audio and it goes full screen (mine has Nav) you'll see arrows for folders pointing each left and right.

When driving you have to steady your hand on the dash a press repeatedly to navigate the folders.

Tip - only put stuff on their that you like!