Hi,
I have a Samsung Q70r tv and mi box. Everything works fine except when I try to play hdr downloaded content. The colours look weird. Example photo from a TV series I tried to play in VLC.
I currently use 4k smpte and ycbcr444 10 bit. I tried all combinations but nothing seems to work.
What TV are you using? Maybe somebody has the same one. I have a Vizio TV that never displayed HDR correctly. The MiBox really should match up with the TV automatically though.