[Q] noob first post looking for a wee bit of help

hi all i have been looking around the site to see how to root my galaxy tab 10.1 with 4.0.4 firmware on it i have seen a lot of good post's for what
i want to do but the problem is i dont know what firmware it was on when i unboxed it when i switched it on it wanted to update so is there any
way to see what firmw are it was on before the update and is it possible to root it any help will be appreciated thank you .:)