Q5 Pro how to remove default video player and replace it with the MX player?

[rebekic]

I have Q5 Pro. How can I remove the default video player and replace it with the MX player?

Also how can I set default video player because everything is locked and I cant set MX player as a default player.

The main reason I want to replace the default video player is the official Plex android premium app. I cant make it to play videos without been transcoded on the Plex server, I want direct stream or direct play.

I got this problem only on Q5 pro. On every tablet and on every phone plex is working like a charm, also mxplayer is working like a charm and I can use in official premium plex app the external player which I use mx player and everything works like a charm.
But nothing works like it should on q5 pro.
I need help.

[Eriol]

This is for Kodi:
http://www.futeko.com/newforum/index.php?topic=1566.0

But I can't help you with Plex.