If one of the buttons says AP on it, its 3.09. Otherwise its probably 3.07. The title should say Odin 3 or something similar if I remember right.
What did you use to edit it? What steps? And you are rooted, correct?
I use the built in text editor with Root Explorer. Most file managers should have the same. If doing this on the computer, make sure you are using Notepad++.