Is it possible to add or force a 50HZ refresh rate when not listed under Settings > System > Display?
I have an Intel Celeron and a AMD E450 Nettop PCs and with any version of LibreElec including 8.0 both only offer the refresh rates 23.98Hz, 24Hz & 30Hz at 1080p resolution when connected to my Sharp TV. The same PCs offer the full range of refresh rate up to 60 Hz when connected to other TVs at 1080p
If I install Windows on the same PCs connected to the Sharp TV the full range of refresh rates are on offer up to 60 HZ at 1080p.
If I install Linux (Ubuntu) on one of the PCs I am only offered 23.98Hz, 24Hz & 30Hz at 1080p resolution so looks like a Linux problem!
However my RPi2 running any version of LibreElec connected to the Sharp TV at 1080p, 50Hz refresh is one of options.
Chris