Currently have zgemma h92s and samsung 4k. When checking settings on zgemma cant see setting to have refresh rate set 60hz. 2160p30 the tv does support 60hz ?
You have different settings in use which can be changed if needed.
Scroll down and click refresh rate and left or right arrow will alter setting.
Other setting i would change is display 16.9 content as Letterbox and not Stretch Full.
You might have to rerun user interface for correct picture to fit screen.
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