iOS 4.2.1 Jailbreak and Unlock: What you Need to Know

As most of you know, Apple today has released iOS 4.2.1 for iPhone, iPad and iPod touch bringing multitasking to iPad, AirPlay, AirPrint, unified mail and some new features to iOS devices. Since I have received lots of questions about iOS 4.2.1 jailbreak and unlock, let's show you what's going on and what's your situation of jailbreaking.

iOS 4.2.1 Jailbreak
There's no new tools released for iOS 4.2.1, but we tried the latest version of Redsn0w and it works on iOS 4.2.1 the same as it done iOS 4.2.1 GM, so you can follow our previous guide posted here to jailbreak iOS 4.2.1 using Redsn0w and then use our guide posted here to patch Cydia and run it on iOS 4.2.1.
iOS 4.2.1 Unlock
Yes, the new version of Ultrasn0w should be released today, tomorrow or this week. It should come out a day or 2 days at most after iOS 4.2 is released (as pr3omised), so we can see it anytime now.

In case you updated to iOS 4.2.1, you will notice that it's baseband is different from iOS 4.1's one but they both will be unlocked by the same tool as the new baseband doesn't catch any holes. We'll have to wait and see what happens.

Save SHSH Blobs
If you’re on iOS 4.1 and jailbroken, by this point you should know how to save your SHSH blobs via TinyUmbrella to ensure untethered jailbreak as soon as iPhone hacker comex pull another trick out of his hat, the iOS 4.2.1 jailbreak is tethered on all iOS devices except iPhone 3G, iPhone 3GS (old bootrom) and non-MC iPod touch 2G.
Though all this, I highly recommend waiting to upgrade for the official tools, but if you feel the need to give it a try right now.

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