*As usual a big thanks to the iPhone Dev-Team for their hard work and contribution to the iPhone community. To use Redsn0w to help you boot back into your jailbroken device simply select Just boot tethered right now from the options window and click Next. When your iPhone finishes rebooting (5 minutes or so) it will be jailbroken with Cydia on the SpringBoard. Once this is complete you will be notified that RedSn0w is done. RedSn0w will then begin uploading the new RAM Disk and Kernel. Release the Power button and continue holding the Home button until RedSn0w detects the device. If you have an iPhone 3GS with the new bootrom you will only be able to perform a tethered jailbreak at this time. Hold down both the Home button and the Power button for 10 seconds. 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. You can find more help with DFU mode here RedSn0w will now guide you through the steps to get into DFU mode. Please plug your iPhone into the computer and make sure its OFF then click the Next button Make sure Cydia is selected and click the Next button to continue. RedSn0w will now prepare the jailbreak dataįrom this window you can select the jailbreak options you would like. Once the firmware has been verified click the Next button to continue. Select the 4.2.1 firmware ipsw we placed in the Pwnage folder on our desktop then click Open. b) Run iTunes 10.1 and Update/Restore to the original iOS 4.2.1 firmware. As we explained yesterday, thanks to a combination of pwnage2 exploit, the arm7go exploit, 24kpwn, and LimeRa1n, you will get an untethered jailbreak for iPhone 3G, older iPhone 3GS, and non-MC iPod touch 2G. a) Download iOS 4.2.1 GM & iOS 4.1 (both versions of iOS are required for jailbreaking with Redsn0w 0.9.6b2). Once RedSn0w opens click the Browse button The Dev Team just updated RedSn0w to version 0.9.6b4, which will jailbreak iOS 4.2.1. Once iTunes has finished updating your iPhone to the desired firmware open the Pwnage folder on your desktop and launch the redsn0w application from the redsn0w folder we extracted earlier. Navigate to the Pwnage folder on your desktop and select the 4.2.1 firmware ipsw. Restore is preferred as it won't create any wasted space on your iPhone. Now hold down Shift and click the Restore button. Select your iPhone from the list of devices on the left. Back up your device (in case anything goes wrong). Likewise, download the latest 4.2.1 firmware from below and place it in the same folder.Ĥ.2.1 (4): iPhone3,1_4.2.1_8C148_Restore.ipswĮxtract the redsn0w executable from the RedSn0w zip file into the same folder.Ĭonnect your iPhone to the computer and launch iTunes. Jailbreaking iOS 4.2.1 with Redsn0w 0.9.6b4 on Mac OS X (the steps should apply the same on a Windows PC) Step 1. Create a folder on your desktop called Pwnageĭownload RedSn0w from here and place it in the Pwnage folder.
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