In order to jailbreak and unlock iPhone 3G, 3GS or iPhone 4 with 4.2.1 firmware, you need to be aware of the following information. Once your iPhone is restored to the latest firmware, you can now move to the next step that involves jailbreaking your iPhone using RedSnow. Then we'll look at how to put your iPhone in DFU Mode. Your iPhone is now unlocked.
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iOS 4.2.1, Download iOS 4.2.1 firmware for iPhone 4, 3GS, 3G, iPad, iPod Touch 4G, 3G, 2G. Download iOS 4.2 for iPad build 8C148, download Links
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How to downgrade iOS 4.3 to iOS 4.2.1, 4.1 on iPhone 4, 3GS, iPod Touch 4G, 3G, iPad. guide to Downgrade iOS 4.3 to 4.2.1, 4.1 firmware. tinyumbrella
Apple released iOS 4.2.1 firmware for iPhone, iPod touch and iPad. If you are unable to connect via iTunes, download iOS 4.2.1 firmware update for iPhone 4, iPhone 3G S, iPhone 3G, iPad 3G, iPad WiFi, iPod Touch 4G, iPod Touch 3G from direct links here and update the device offline.
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Want to upgrade your iPhone 3G / 3GS / 4 or iTouch 2G / 3G / 4G or iPad to the latest iOS 4.2.1? Below you can download iOS 4.2.1 for the iPhone, iPad or