I have the Contour 2 with voice remote XP11-RF. The remote's TV Input button works on the TV's HDMI port but does not play anything connected to the USB ports.

I connect Flash drives with .MP4 movies or photo's to one of my Samsung TV's USB port.  When pressing the TVInput button, I can see the various Inputs (TV, HDMI, my Cox, and my flash drive USB).  I can move the cursor across the screen and the HDMI or TV will play.  However, when I select the attached flash drive by pressing OK, I get the Contour screen instead of viewing the USB drive contents.  I end up having to use the Samsung's remote to activate the USB.  I'm not sure if my previous older DVR ever had this ability to open USB (don't remember trying).  Just curious if anyone tried this...my guess it doesn't work, and never should.  The Samsung remote does, when using the DVR, work for on/off, mute, volume and input.