Just downloaded Ultraflix app from play store. Lots of good 4K content. My questions are, I have a panasonic 4K tv and the droidbox hdmi cable is in the 4K hdmi port on the TV. Do I need to choose the 4K setting on the droidbox, and what refresh rate do I set it at? Do I keep the 4K settings on, even though most of the time I will be watching 1080P?. And finally, how do I know I am watching pure 4K?