At last, Apple has released iOS 4.2.1 which was expected to be released as iOS 4.2. Besides iPad, iOS 4.2.1 update means a lot for iPhone 3G users. If you update iPhone 3G to iOS4, you would have remembered the poor performance of iPhone 3G. It was promised to fix the issues in iOS 4.1 and it did but it was never like iPhone 3GS. It looks like Apple has managed to fix a lot more in iOS 4.2.1 for iPhone 3G and performance is much better.
iOS 4.2.1 or iOS 4.2 has been available since months to developers and they were able to test the adjustments for iPhone 3G and give feedback. Obviously, a lot of users would like to jailbreak iPhone 3G 4.2.1 and free there iPhone from Apple’s control. iPhone 3G users are lucky as their handsets contain old bootrom which are prone to untethered bootrom exploit for life. Jailbreaking iPhone 3G 4.2.1 is also not different.
iPhone Dev Team has released redsn0w 0.9.6 b4 which now fully supports jailbreaking iPhone 3G 4.2.1. Remember, it is an untethered jailbreak and you don’t need to worry plugging in your iPhone 3G 4.2.1 on a restart with PC/MAC.
Warning: If you are using ultrasn0w unlock then you should stay away from upgrading iPhone 3G to 4.2.1 for now. However, iPhone 4.2.1 unlock for your device is hopefully coming this week. Until then, hold back from iOS 4.2.1.
Here is a step by step guide to accomplish iPhone 3G 4.2.1 jailbreak. Before proceeding, make sure that you have grabbed following items.
Step 1: Upgrade your iPhone 3G to final build of iOS 4.2.1.
Step 2: Launch redsn0w and click “Browse”. You have to select iOS 4.1 for iPhone 3G to move forward. [Remember, it is 4.1 firmware]
Step 3: Cick “Next” and redsn0w will start preparing data to jailbreak iPhone 3G 4.2.1.
Step 4: Select the options you want to enable along with “Install Cydia”.
Step 5: Turn off the iPhone and connect with computer.
Step 6: Now, follow redsn0w’s instructions to get iPhone into DFU mode.
Step 7: You can take a rest while redsn0w finishes the installation. Once it reboots, you will have a jailbroken iPhone 3G 4.2.1.
Other Jailbreak Guides and Notes: