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I have the 49xd8099bu Android TV.
Neither Kodi nor YouTube deliver 4K video, although the built-in video player will. Kodi reports 1080p resolution, as does 'Developer Tools' from Google's Play store.
A 4K test file is available from the below link, for those who might want to test the resolution. http://forum.kodi.tv/showthread.php?tid=261768
Apps can't deliver 2160p unless they know that the screen is capable of delivering it. How, then can the default be overrulled?