[evlo]

Nvidia Shield = does all that you require

Well yes, it could play everything, but UI was mostly low res crap (i did not try hacking it) and colors were never right - either all dark colors were just black, or some other weird issue. Everybody recomends it, but is just not good player.
I mean maybe if someone is geek enough to play with all the settings, but atv 4k for comparison, cost similar and does not have these issues. Still I'm not ok for paying that money for device with 4k in name that can't do 4k youtube, that is just stupid, imo.

Good point about no gigabit intenet on km9 thought, I also found that beelink has android tv box with s912 - so two chinese manufacturers do Android TVs.
According to wikipedia x2 and x3 supports 1000M so I dunno why they went for 100M only.

I also managetd to find actual manufacturer website http://www.videostrong.com/Google%20Certified/98.html