How to Update iPhone 3g/3gS & iPhone 4 to Custom iOS 4.2.1 Preserving your Baseband

This video describes how to update your iPhone 3g/ 3gS or iPhone 4 from any firmware lower than 4.2.1 to a Custom 4.2.1 Firmware. It could be 3.0, 3.1, 3.1.2, 3.1.3, 4.0, 4.0.1, 4.0.2, Custom 4.1. In other words if your baseband is 4.26.08, 5.11.07, 5.12.01, 5.13.04, 01.59.00 then you can successfully follow this video directions. And if your baseband is 5.14.02 or 5.15.04 then you will need to follow the video given at the end of this written description. All this will be an Untether way of Jailbreak covering both new or old bootrom for your particular devices. METHOD: First use Redsn0w 0.9.6b6 to put your iPhone in Pwned DFU mode so that it is able to accept Custom Firmware file. When iDevice in Pwned DFU mode then simply open iTunes and hit Shift + Restore (Windows) or Option key + Restore (MAC) and load in Custom 4.2.1. Sit back and relax till updating/restoring process is done. When it is all ready then simply install "Ultrasn0w" from Cydia. You will be fully Unlocked and Jailbroken on 4.2.1 Firmware. Download Redsn0w for WINDOWS: uploading.com Download Redsn0w for MAC: uploading.com IF above Redsn0w gives you issues while running, then run these versions of Redsn0w Mac: uploading.com Windows: uploading.com Download Official iOS 4.2.1 firmwares iclarified.com (Browse in Redsn0w 0.9.6b6) Below are the CUSTOM 4.2.1 Firmwares: (Browse in iTunes) Custom 4.2.1 Firmware for iPhone 3g - www.4shared.com Custom 4.2.1 Firmware for iPhone 3gS- www.4shared.com Custom 4.2.1 ...
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