At this time, the way to jailbreak your iOS 4.2 device is by using a tethered jailbreak. This means that whenever your iDevice turns off or battery dies, you have to plug the device into iTunes to reactivate. It’s a decent process, but not very convenient.
Earlier in December, Comex (Spirit jailbreak, JailbreakMe) indicated that an improved untethered jailbreak for iOS 4.2.1 was on its way before Christmas 2010.
This week via Twitter, MuscleNerd of the iPhone Dev-Team, has given further confirmation of an untethered jailbreak for iOS 4.2.1. The release date, once again, is planned for Christmas 2010. No specific dates were provided, but we may see a new efficient jailbreak next week.
scotty6kids78: @MuscleNerd are we any closer to the unteathered #jailbreak for the new #ios4.2 on #iphone4 ?
MuscleNerd: @scotty6kids78 itâ€™ll be here by Xmas (not because weâ€™re sitting waiting for Xmas, but because itâ€™s achievable deadline)
This upcoming untethered jailbreak will most likely be available for all current iOS 4.2.1 devices. That includes iPhone 4, iPad, 2010 Apple TV, and the fourth generation iPod touch.
Oddly enough, the original tweet by MuscleNerd seems to have been deleted. There has been no update on the removed tweet, but could this represent a delay in the jailbreak tool? We’ll see next week.