I have never jailbroken my iphone before so I've decided to do so now. Iphone dev team says that I need pwnagetool 3.1 but it also says I need to CONTINUE using ultrasn0w. What is ultrasn0w and if i haven't used it before can i still jailbreak? Ok so I have pwnagetool and i have successfully created my ipsw. Now will this erase everything i have on my iphone? Will I be able to back it up somehow and recover my data later?