I have found a good test scene, at the beginning of The Hobbit, The Battle of the Five Armies, at 11:30 right after the dragon death, Ori is in foreground with some other fellows at his side: after a reboot I can hardly see him on an almost black background, but after I play any 4K video I can see the details of the fellows in the background.
The Box_Fix app is useless (does it need root?)
To me it appears more as a range problem than a brightness one, as if playing a 4K video properly initializes the chipset to use the full brightness range... Something like the option "Use limited color range" in. Kodi for PC (http://kodi.wiki/view/video_levels_and_color_space)
Anyway it is not a big problem to me, the box is rock solid and doesn't need to be rebooted so I just play a 4K video and leave it in standby :-)
Again thanks for your work, SC.
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