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Chronic Dev Team had released greenpois0n to jailbreak iOS 4.2.1 for Windows for iPhone 4, iPhone 3GS, iPhone 3G, iPod Touch 4G,iPod Touch 3G and iPad few weeks back.
If you had trouble jailbreaking your iPhone, iPad or iPod touch using greenpois0n then here are some troubleshooting tips based on inputs from our fantastic readers that we hope will help you in successfully jailbreaking your iOS device.
Use the latest version of greenpois0n: