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blastexx replied to smorf's topic in iPhone & iPod TouchI have updated my iphone 3G with Redsn0w 0.9.6rc14 and an original 4.2.1 firmware from apple. You can only do this if you have an official carrier unlock in your country, if this is true you can proceed. Start redsn0w and choose cydia and deactivate, place your exotic SIM in your iphone and follow the instructions on the screen. after the jailbreak start iTunes, iTunes will ask to update. DO NOT UPDATE !! iTunes will then say it's unlocked your iPhone and you will have an unlocked and jailbroken 4.2.1 installation. This is the way i did it and it worked for me. good luck!