What OS is my tv box running?

On the main opening screen of your tv box (not in Kodi), look for Settings.
Some boxes may not have the words Settings, but a picture of a gear or a screwdriver.

Found Settings? Scroll over and click it. 

On some boxes, you may also need to click More Settings or Advanced.

Now click on About.  

Look for Version, that will tell you what operating system (OS) your tv box has.