(KODI BOX) NEED HELP, ISSUES I DON’T KNOW HOW TO SOLVE

Hi guys,

I’m a new user of Kodi and the Kodi Box. I am facing a view issues which for some reason I can’t find solutions to online, so I’ve come here. When using the Kodi Box on my tv, I have faced these issues.

Issues:
Dark brightness on films/movies
Stuff not looking HD
NextUp Services not working on TV Shows online
Poor volume control

Also is there a way I can make Kodi only give me things in HD? Thanks guys