can i jailbreak my unlocked iphone 3gs running 4.2.1 firmware?

tiggz001

New member
i need help i have tried redsnow, tinyumbrella. redsnow seemed to work then it said the programme had to close while my iphone was still downloading the jailbreak software so it failed i have tried deleting the programmes and restarting my computer and trying them again with no luck.. i used to have it jailbroken using green poised0n that worked but i have accidently updated my iphone and now i have los cydia installous. so i am havin probs jailbreaking cause my provider has unlocked my iphone recently...PLEASE HELP....
 
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