Hi ive just got a used galaxy s2 given to me from a friend who has upgraded. It was originally on the 3 network but is now unlocked. He did a factory reset before giving it to me. It is currently on the gingerbread version of android and when I go to check for updates it says no updates are available. Can anyone help me with what I need to do to update it to a later android version please? Thanx in advance