Additional Infos:
Tested with the HDMI cable out of the box also, same result.
Checked the TV specs: (see enclosure) > should no problem at all.
At the box:
Changed the custom display format to 1080p (several Hz) > it works, 10 Bit possible
If I go back to 2160P > only 8 Bit possible
So, is there something wrong, problem in the box?
As I asked before, experts meaning are welcome.
Many thanks
[attachment deleted by admin]