If it's one of the "fully loaded" ones they advertise, stuffed with banned addons(wiki) that violate our piracy policy(wiki) then don't touch it with a bargepole. It will give you no end of issues, and is entirely unsupported here (as is any device containing such piracy junk).
If you get one of those then I'd return it if I were you.
If you still want to play with it, I'd uninstall Kodi (with all the add-ons) and reinstall it from the Play Store. Then I'd see if I could get it to boot off a micro-SD card into LibreElec. See https://forum.libreelec.tv/thread/2156-8...905-s905x/.