Chronic Dev-Team has just updated the greenpois0n for Mac and Windows to RC6.1. The updated version includes the iBooks fix by comex. Apple implemented the anti-jailbreak code in it’s iBooks app which refuses to open your e-books if your device is jailbroken, and asks you to restore your iOS device with iTunes.
Download greenpoi0n RC6.1 for Windows and Mac from here.
After downloading the latest greenpois0n you can follow the step-by-step guide posted here to jailbreak your iOS 4.2.1 device.
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