upgrade Android tablet to lollipop for unity project

Nabi makes a giant android touchscreen which I would like to use for a unity3d project. It’s called the big tab 24. It comes with kit kat 4.4. and on top runs it’s own OS for kids.

https://www.nabitablet.com/nabi-big-tab-hd24

I need some sound features that exist only in lollipop 5.1 for my project.
How would I update a device like this to lollipop 5.1?
Would I need to root it? I am a complete newbie at android having previously only worked on IOS.

You’ll need to consult your tablet manufacturer, they may have a lollipop upgrade available. Alternatively you can check the software update option in settings if you have one to see if an update is already available.