The Chronic Dev Team released Greenpois0n RC5 to jailbreak iOS 4.2.1 completely untethered for iPhone 4, 3GS, 3G, iPod Touch and iPad without requiring SHSH blobs for iOS 4.2b3. Download Greenpois0n RC5 to Jailbreak iOS 4.2.1 and use following guide to jail break iOS 4.2.1.

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