I have an old (2011) Acer Revo AR3700-U3002 running OpenElec 5.0.8. It gives me OK 1080p video, but chokes on HEVC x265 and UHD 4K videos. Is there any better version of LE that will give me more ability to play the newer video formats? I wonder if it is even possible to upgrade the GPU to get 4K playback? What build do you recommend, and where do I find it? How would I perform the upgrade? I'm a newbie in these matters.