Fire TV 4k + Plex + 4K TV = Problem/bug
I Found a problem/bug, Ok first the setup.
1) If you hold Select & Down Arrow (at the same time) for 5 sec. then release and push the menu button a dev menu pops up.
2) Enable System X-ray (it will show you system stats)
3) If you look on the top left you will see where it shows you what mode the fire tv is currently in
Ok now the problem, from what i read on the forum is that fire tv dont switch to 4k mode unless you have a 4k h.265 movie playing, from what i found out this is false. If you open youtube app, as soon as you open the app you will see that the fire tv switched to 4k mode (but when you open plex it stays in 1080 mode). So saying that the only way to get to 4k mode is to play a 4k h.265 movie is not true. If plex program the plex client to start in 4k mode even if you play a 1080p movie/show/whatever it will be played in 4k mode (test it open youtube and play a 1080 video it stays in 4k mode it dont switch). So people like me who have 4k movies in H.264 format, if fixed, will be able to watch them in true 4k. Would love to hear back from a dev about this or anyone else.