Minutes after the official release of iOS 4.2.1, the folks at the iPhone Dev Team were able to roll out a compatible jailbreak tool for those enjoying the benefits of a hacked device. A compatible version of Cydia is unavailable for the latest iOS right now, but the jailbreak is, in all senses, a go for iPhone, iPod touch, and iPad using the Team’s redsn0w 0.9.6 beta 4.

Important!
Before users proceed with following the steps below, Pctipsbox would like to note that jailbreaking is not particularly encouraged.

Also, see this post for compatible devices and the particularities involving each device model with respect to this jailbreak. For example, this is a “tethered” jailbreak which, for some, may involve hassle they’d rather avoid. Go here to learn more about the drawbacks involved by a “tethered jailbreak.”

With all that out of the way….

Jailbreaking iOS 4.2.1 with Redsn0w 0.9.6b4 on Mac OS X (the steps should apply the same on a Windows PC) More »

An unlock for iOS 4.2.1 is almost ready to go, signals iPhone Dev Team member Musclenerd, via Twitter. Apparently, Apple tried to block their ultrasn0w unlock tool via “aggressive compiler optimization,” but the Team was able to crack it and is gearing up to release a new version that will do the trick for iOS 4.2.1 users, albeit only for those wielding an old-generation handset.

“Finally got ultrasn0w working fully on 4.2.1,” Musclenerd writes on Novemver 27. “Apple inadvertently(!) broke ultrasn0w via aggressive compiler optimization,” the hacker explains.

In a separate note that hit the micro blogging service just minutes ago, Musclenerd adds: “When we update ultrasn0w today, 100’s of thousands (maybe millions?) will see red badge. Trying to make it safe for all.” More »