I am trying to jailbreak my friend iPhone 4 on 4.0.2. If I try jailbreakme.com it says iOS too old needs to update to 4.0.1(which is strange as this iPhone is already on 4.0.2. If I try using greenpoisi0n it keeps failing to jailbreak. I do not want to use pwnagetool as for that I will have to back his phone and rewrite iOS , is there any one way I can try jaibreaking, obviously without updating the baseband? How to jailbreak iPhone 4 on 4.0.2? Please help. Thanks.