I can stream 4k directly to my tv no problem and my xbox is in 4k as well. My xbox is hard wired through an ethernet cable to the back of the gateway, that port blinks green on the gateway. When the flex was connected via ethernet, that port would light up orange. I tried 3 different ethernet cables and tried wireless. Everything had the same result once the flex box was turned off for more than 3 minutes. All of my wireless items in this room, where the gateway modem is, have a wireless speed of around 200 mbps while my hardwired xbox receives up to 1100 mbps.
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