I uninstall some pre loaded addons but when I Power down.. Then Power up they show up again .. How do I permanently uninstall them ?? Also I notice some addons when I update..the links don't work..but if I don't update them the links work .. Such as ESPN 3 & a add-on called nitroid streams that came with the box..
Kodi does not come with pre-installed user add-ons, so I suppose you're using some cheap android box that came preloaded with illegal add-ons. We don't give support for these. If that's not the case, feel free to give more details about your problem. A
Debug Log might give some hints.
Googling "its a Nitroid XD4 Box" tells me that this box is preloaded with illegal add-ons. You won't get support for them on these forums, I suggest you contact the people who sold it to you for support.