Soon after the iOS 4.2.1 update for the iPad, iPhone and iPod Touch was released to the public on Monday, the iPhone Dev-Team released a software jailbreak named “redsn0w” that allows users to customize their devices beyond Apple’s restrictions.
The Dev-Team explains on its blog that the latest jailbreak was nice and quick thanks to previous exploits such as “pwnage 2” and “limera1n.” The iOS 4.2 jailbreak is compatible with all iOS devices, however, more recent devices will require a tethered jailbreak.
The iPhone 3G, older 3GS models, and second-generation iPod Touch devices with models numbers that don’t begin with ‘MC’ can all enjoy an untethered jailbreak.
The iPhone 4, newer 3GS models, the iPad, and the fourth-generation iPod Touch require a tethered jailbreak, meaning that once you’ve performed the hack, you’ll need to connect your device to your computer every time you want to reboot it. If your device crashes, or the battery dies while you’re away from a computer, you won’t be able to start it up. Although, Dev-Team member Comix is already at work on a fix for this.
As for as unlocking goes, the Dev-Team have advised that it’s best to steer clear of ultrasn0w for now and await further updates. Those relying on an unlock for their device should refrain from updated their iOS firmware for the time being, and keep an eye on the Dev-Team’s blog to await more news.[via Apple Insider]