I just wondered if is is at all possible to completely back up the current stock o2 ROM that is on my s2 GT-i9100P so that I am able to revert back to it in the future?
This is of course possible through whats called a Nandroid back up. Very simple and relatively fast. You can do this through Recovery mode (if youve got this far yet) snd go to back up. Very simple once youve got used to the navigation of recoverg mode. If you need more guidance feel free to ask