1080p video on Youtube doesn't work?

A

AC Question

I have a JXD S7800b. My device is rooted and I read in a forum that changing my version to 4.4.2 or 5.0.0 would make it work, but neither did. I've tried clearing the cache/data, disabling, re-installing and using the factory version of the app and there's no difference. I don't get 480p or 1440p either.