iOS 4.2.1 Untethered Jailbreak is Going to be a Cydia Package?

You may don't need to restore or re-jailbreak your device to get the new iOS 4.2.1 untethered jailbreak, according to this tweet from Comex. This means that you'll not need to install Redsn0w and use it to get the untethered jailbreak, it should be added a Cydia package on some repository like BigBoss or ModMyi on Cydia.
However, comex's untethered jailbreak is delayed and won't be released by the Christmas Eve so you have to take in mind that the iPhone Dev Team has it's own backup plan that requires iOS 4.2 beta 3 SHSH blobs to be able to get the untethered jailbreak. More updates as they come ! Stay tuned!

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iOS 4.2.1 Untethered Jailbreak For iPhone 4, iPad And iPod Touch 4G Released

As expected, iPhone Dev team has just released a new version of Redsn0w (Redsn0w 0.9.7b1) that implements the “backup plan” for iOS 4.2.1 untethered jailbreak.

Redsn0w 0.9.7b1 can be used to (untethered) jailbreak iPhone 4, iPad and iPod touch 4G on iOS 4.2.1. Please note that Redsn0w 0.9.7b1 is meant only for beta testers and not for the general public as there are still some known issues that need to be addressed.

Please go through the following points before trying the new version of Redsn0w:

This is a beta tester program. It’s not a general release! Things can go very wrong, so please don’t even consider testing if you have pictures or other media on your device that you haven’t backed up!
For the same reason, please don’t participate if you rely on the ultrasn0w carrier unlock. Wait for the final version!
Until we fix some sandbox issues with bluetooth, the bluetooth functionality is disabled.
This very first beta1 is limited to iPhone4, iPad, and iPod touch 4G.
Cydia must have your 4.2b3 SHSH blobs saved on file. (As we approach a general release, we’ll provide a way to let you use locally saved hashes too).
You must already have the usbmuxd software installed and running on your Mac (this requirement will eventually go away too). The correct invocation of the relay is just as that page says: “./tcprelay.py -t 22:2222”. If the relay isn’t installed or running correctly by the time the redsn0w ramdisk has started, you’ll need to restore to stock FW again to try it again. Please test it beforehand to save yourself some time!
It is also important to note that jailbreaking your iDevice may void its warranty so please proceed with caution and at your own risk. It is always a good idea to take a backup of your iDevice, refer to this post for more details.

Please note that these are some of the known bugs:

Task switcher causes Springboard crash (temporary workaround is to use SBSettings process list)
Bluetooth currently disabled due to sandbox problem
You can checkout if Cydia has saved iOS 4.2 beta 3 SHSH blobs, launch Cydia and wait for it load the main page. You should see SHSH: 4.2b3 on the top of the page.

If you plan to give it a shot then download Redsn0w 0.9.7b1 for Mac using this link. Please don’t forget to let us know how it goes in the comments and also provide your feedback on Dev Team’s blog, which will help them to iron out the issues before the public release.

Mac Owner? Wann Try the Untethered iOS 4.2.1 Jailbreak?

I know that most of your are waiting eagerly for the untethered jailbreak solution on iOS 4.2.1 for new-generation iOS devices. As most of you know, the iPhone Dev Team already has the backup plan to achieve iOS 4.2.1 untethered jailbreak for Christmas Eve.
Just a few minutes ago, the iPhone Dev Team has confirmed the release of untethered iOS 4.2.1 jailbreak for the Christmas Eve and asking for Mac OS X owners to help them with testing the the backup plan.

Over the Christmas weekend we’ll be releasing a version of redsn0w that implements the “backup plan” to the 4.2.1 untethered jailbreak. We’re seeking your help to test this redsn0w and find any bugs before we do a general release!

(If you have an iPhone 3G, or an old-bootrom ipt2g or iPhone 3GS, you already have an untethered jailbreak! Just use the latest public redsn0w.)

To keep things manageable, this will be a Mac-only test program. We also request that any volunteers *NOT* need the ultrasn0w unlock (in case things go very wrong).

Right now, the “backup plan” requires that you have the 4.2b3 IPSW on your Mac, and that Cydia has your 4.2b3 SHSH hashes. Please don’t pirate that 4.2b3 IPSW! (We’re also working on a way that this technique might apply to all those with 4.1 IPSWs, but that’s not the first goal right now.)

To survive in this, you must be a Mac owner, got iOS 4.2 beta 3 SHSH blobs on your Mac or that Cydia has your 4.2b3 SHSH hashes that was automatically saved (in the status bar), and have a new-generation iOS device (i.e. iPhone 4, 3GS, iPad, iPod 4G, 3G).

If you fit all the above qualifications, so you can follow @redsn0w_testers on Twitter and give the Dev-Team a comment in this post to get the backup plan right now ! Let us know how does it go with you. Also stay tuned for a Christmas launch for public