I own an 5500 and until now we have no way of rooting, install unknown source apps or "force" the tv in any other way.
You can play movies in 1080p with mxplayer or kodi, just the interface is 720p in all apps. I have an 32" display and is not that bad, I imagine that for you in 48" is frustrating.
Also youtube will not play with full HD. Also you cannot use a mouse
Hopefully some future update will solve something. Until then we are stuck like this.
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I have a 8809 and have had problems with plex not showing any subtitles, no sound when I enable subtitles and goes back to plex menu when I enable 3D. I've tried other external players with plex without any difference. I haven't tried kodi, cuz I have insufficent storage left (have istalled four apps).
Now I use serviio on a mediaserver and use the built in DLNA feature on the TV and love it! The best part is that the subtitles button on my remote actually do something now.