Windows/Mac: If you're in a hurry to jailbreak your iOS 4.2.1 device, the iPhone Dev-Team (they're the band of hackers regularly releasing the best jailbreaking tools) has already released a Windows and Mac version of jailbreaking tool redsn0w that jailbreaks devices running 4.2.1. The catch: It's currently a "tethered" jailbreak, meaning "that each time your device loses battery power or needs to be rebooted, you must attach it to a PC or Mac to boot into the jailbroken state" Unless you're in a huge hurry to jailbreak, you're probably best off waiting. [Dev-Team Blog]
iOS 4.2.1 Tethered Jailbreak Available
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