I've got a 4k Sony Brava tv (KD-55XD8599). I've tried connecting my Neo U1 into every HDMI port but cant get it to play 4k content. When I use the Youtube app the highest resolution I can select is 1080p. When I check Kodi settings the resolution option is greyed out and set to 1080p (it won't let me increase OR decrease the resolution). I've looked through the android settings but there's no option to change the resolution. Anyone able to help please?