Well since you haven't been on for 4 months, then maybe you should check your systems FW, if it's on 3.55 or below then your good to jailbreak, if however you're not then there is no jailbreak, but QA flagging has just been found, (better than cfw) so it's suggested that you do not update to 3.66 (the latest firmware) since it may patch QA flagging. Hope this helps