There've been two developments today that are making things look good for a fast jailbreak for the new iOS4.2.1 software update for the iPhone, iPad and iPod Touch.Mobile Substrate has been updated. This is a framework that allows many apps for jailbroken devices work. It also forces your device into Safe Mode if something bad happens.
And one of the most-used jailbreak apps - SBSettings - has also been updated for iOS4.2.1.
Small moves, but, as I said, looking increasingly good for a jailbreak. Both updates are live now in Cydia.
At the moment, you can use Redsn0w to jailbreak older devices, but if you use it on newer ones you'll get a tethered jailbreak, which means you have to re-jailbreak every time you reboot your device.
The message is continue to hold off from updating to iOS4.2.1 until a new untethered jailbreak is ready for your device.
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