Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.
I have a roku tv, vizio. My TV displays "unsupported mode" and will not respond allowing me to change it back from 4k to normal. (whatever normal is). I switched it from "auto detect" just to see if it would work and it didn't but now I can't get it back.