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https://www.youtube.com/watch?v=OfcPeoLf4tU
xperia z ultra resolution of problems
the problem is not solved somehow
he is talking about the color banding of the display
I don't see a problem with the screen but the wallpaper itself is the issue and has the same effect on a few wallpapers of the same design and applying the same wallpapers to a Z1 or M2 as I just have has the same effect
I've checked the image you have in the video on my Pc and have the same effect so still not sure this is a screen issue