iPhone Dev Team has released PwnageTool 4.1.2 to allow iPhone users to create and update their iPhone with a custom pre-jailbroken iOS 4.1.
This guide will provide iPhone 4, iPhone 3GS and iPhone 3G users with step-by-step instructions to update and jailbreak their iPhone with iOS 4.1.
Some important points before we proceed:
Please note that jailbreaking your iPhone may void its warranty so proceed with caution.
Don’t forget to backup your iPhone before you proceed. You can refer to this post for instructions on how to backup your iPhone.
Please ensure that your iPhone has enough charge.
This guide is only for iPhone 4, iPhone 3GS and iPhone 3G users.
PwnageTool is only supported on Mac OS X and is not supported on Microsoft Windows. Windows users should wait for Sn0wbreeze that is expected to be released shortly.
Users who want to unlock their iPhone:
PwnageTool does not unlock your iPhone.
You can use Ultrasn0w to unlock your iPhone after you have successfully updated and jailbroken your iPhone with iOS 4.1.
But there is a catch. Ultrasn0w 1.1-1 can only unlock the following basebands (you can check the baseband by going to Settings –> General –> About –> Modem Firmware):
iPhone 4 baseband – 01.59.00
iPhone 3G and iPhone 3GS basebands – 04.26.08, 05.11.07, 05.12.01 and 05.13.04
So if your iPhone is currently on iOS 4.0.2 or lower then PwnageTool 4.1.x will allow you to create a custom pre-jailbroken iOS 4.1 and preserve the baseband so that you can unlock your iPhone using Ultrasn0w 1.1-1.
If you accidentally upgraded your iPhone 4 with iOS 4.1 then its baseband would have got upgraded to 02.10.04. Unfortunately, 02.10.04 baseband shipped with iOS 4.1 for iPhone 4 cannot be unlocked nor can it be downgraded.
Similarly, if you accidentally upgraded your iPhone 3G or iPhone 3GS with iOS 4.1 then its baseband would have got upgraded to 05.14.02. Unfortunately, 05.14.02 baseband shipped with iOS 4.1 for iPhone 3GS or iPhone 3G cannot be unlocked nor can it be downgraded.
Please read the instructions carefully especially the ones highlighted in bold.
If you meet the requirements mentioned above then you can proceed with the step-by-step instructions to jailbreak your iPhone using PwnageTool.