***If you are already on iOS 4.2.1 you can skip this step.Ĭonnect your iPhone to the computer and launch iTunes.
#Redsn0w download 4.2 1 zip file
IPhone 3G iOS 4.2.1: iPhone2,1_4.2.1_8C148a_Restore.ipswĮxtract the redsn0w executable from the RedSn0w zip file into the same folder. Likewise, download the latest 4.2.1 firmware from below and place it in the same folder. Those with an unlockable baseband and on a lower firmware should use PwnageTool instead to update without upgrading your baseband.Ĭreate a folder on your desktop called Pwnageĭownload RedSn0w from here or here.
You can find out your baseband version in Settings -> General -> About -> Modem Firmware. You’ll need to only restore to custom IPSWs (then again, if you’re unlocker you should already be doing that).ĭon’t update to 06.15 if you don’t need to, you can just jailbreak without unlocking using this tutorial! Only update baseband if you need the unlock and you’re stuck on baseband version 05.14 or 05.15, and you’re willing to assume the above risks. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won’t ever be able to restore to stock firmware (it will fail).If some future baseband comes out with a critical fix, you won’t be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn’t update to it if you wanted to keep your unlock anyway).You’ll be voiding your warranty in a very obvious way. There is no way to come back down from baseband 06.15, and there’s no hiding the baseband version from Apple.Please read the following very carefully before deciding whether to do this. You do not need to do this for jailbreak only. If you are on 05.14 or 05.15 or higher you will need to do this to unlock. This means you will need Redsn0w’s assistance to boot into your jailbroken device.ĭuring this process you can update your baseband to the 06.15 version.
If you have an iPhone 3GS with the new bootrom you will only be able to perform a tethered jailbreak at this time.
#Redsn0w download 4.2 1 how to
This is step-by-step instructions on how to jailbreak and unlock your iPhone 3GS on iOS 4.2.1 firmware using RedSn0w 0.9.6b5 for Windows. UPDATE2: If you have 05.13 baseband or lower – do not update to 4.2.1, use PwnageTool to create custom firmware! UPDATE: Please think first, before you do something.
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