Jailbreak iPad iOS 4.2.1 with GreenPois0n RC5
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GreenPois0n RC5 allows you to easily jailbreak an iPad running iOS 4.2.1, the main advantage to GreenPois0n is that it provides a completely untethered jailbreak solution that can be initiated from both Mac OS X and Windows. This guide will walk you through the process of jailbreaking an iPad with iOS 4.2.1 software.