Update Samsung tablet gt-p5110 to Android 4.1.2

I finally understand a bit better, you actually want to upgrade to a superior version to this one! Sorry for being a bit slow on the uptake! Unfortunately, it is quite complicated to perform this task by yourself, as it requires a lot of knowledge in the field of smartphones/tablets, because indeed it's not as simple as installing Windows on a computer, as the system of a tablet/phone is much, much, much more complex! And finding a reliable, unmodified, and stable version of Android to download online is very complicated.
So I can't help you on this point, I could do it with the materials but by explaining without writing a detailed and simple novel, it's complicated, sorry.

And one little piece of information about rooting, there is a potential risk that you will see your battery draining faster and experiencing a loss of system fluidity. That's the downside of rooting, it requires a lot of resources.