For all devices. iPhone 3GS new bootrom and newer, this is a tethered jailbreak. Which means you will have to run redsn0w again if you: Shut off, reboot, or run out of battery power. Go to blog.iPhone-dev.org download Redsn0w 0.9.6b4. Unzipped the file and run on your comp. Then click browse and choose your 4.2.1 firmware saved on your comp. Then you will have to check the cydia box. Then you will be prompted with instructions how to put your device in dfu mode. Once that's done, the rest is finished for you. THE FIRST TIME YOU DO THIS YOU WILL HAVE TO RUN REDSN0W AGAIN AND ClICK JUST REBOOT BOX THE SECOND TIME. Everytime you reboot or lose power, that's the box you click when re powering.
Http://blog.iPhone-dev.org
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