GreenPois0n for iOS 4.2.1 Jailbreak Release Sooner Than You Think!

Great news from the Chronic Dev Team where Joshua Hill their iPhone developer publicly announce that he's working on a release for the 4.2.1 GreenPois0n jailbreak. That of course after he finished adding the new sandbox patches.

Taken from his recent tweets this release of GreenPois0n though will probably be a tethered jailbreak, just like the recent release of Redsn0w 0.9.6b6. So the jailbreak will only probably applies to the new devices like: iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC Model), iPod touch 3G and the iPod touch 4G. Older devices like iPhone 3GS (old bootrom), iPhone 3G and iPod touch 2G (Non-MC Model) can be jailbroken-untethered right now using tools such as Redsn0w 0.9.6b6. For untethered jailbreak, you will have to use Redsn0w 0.9.7 which requires you to have SHSH blobs of iOS 4.2b3 saved. For newly bought devices that never been jailbreak before, you will have to wait for Comex’s untethered jailbreak tool which is probably released after the next version of the firmware released by Apple.

News! Redsn0w Untethered Jailbreak for iOS 4.2.1 Will Be Released On Christmas

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.)

Redsn0w untethered JB will be released for IOS 4.2.1 but testers will be needed according to MuscleNerd from the iPhone Dev-Team. This has come from the news that Comex's version of the Jailbreak has been delayed for some reason. I'm not so sure about the quality of the temporary solution from the iPhone Dev-Team but for sure I'll not jump straight on it as soon as it is released as I'm pretty happy with what 4.1 has to offer right now. I do believe that the Dev-Team will not rush things out before testing out properly the jailbreak. So let the waiting game begins..the solutions will probably be released in this one or two days..

Guide: How to use Redsnow to jailbreak iOS 4.2.1 on iPhone, iPad, and iPod Touch

In this post I'm going to present to you the method to jailbreak your iDevices (iPhone,iPad,iPod touch) running on iOS 4.2.1

Disclaimer: Please proceed with this Jailbreak at your own risk. I will not be responsible for any mishaps or device failure upon attempting this method.

Jailbreak type:  

• Tethered for iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC Model), iPod  touch 3G and the iPod touch 4G
• Untethered for iPhone 3GS (old bootrom), iPhone 3G and iPod touch 2G (Non-MC Model)

Warning: PLEASE STAY AWAY from this Jailbreak for those on who rely on carrier unlock. This Jailbreak WILL NOT unlock your iPhone.

Tools (Download): 

1. iOS 4.2.1 for iPhone 4, 3GS, 3G, iPad, iPod touch
2. Redsn0w 0.9.6b4 for Windows or for Mac
3. iTunes 10.1 for Windows or Mac

Steps:

1. Download the appropriate version of iOS 4.2.1 depending on your device.
2. Update or Restore your devices using the iOS 4.2.1 you've just downloaded earlier. (A prior backup of your apps and data are advisable upon restoring/updating to 4.2.1)
3. Launch Redsn0w 0.9.6b4 and load the previously downloaded iOS 4.2.1 and then select the 4.2.1 firmware and click 'Open'.
4. Click 'Next' and Redsn0w will begin injecting the firmware for Jailbreaking.
5. Check the 'Install Cydia' option and click 'Next'.
6. Turn your iDevice into DFU mode by shutting down your iDevice and plugging in your iDevice and click 'Next'.
7. Follow the sets of instructions on the screen to boot your iDevice into DFU mode. (Repeat if fail)
8. Wait until the process is complete and after your iDevice has restarted, it will be with the latest iOS 4.2.1 jailbroken firmware.

Additional Step for iPhone 4, 3GS (New Bootrom), iPod touch 4G / 3G / 2G, and iPad ONLY (Tethered)
    9.  Use Redsn0w and repeat step 3-5 but in this case for step 5 uncheck 'Install Cydia' and select 'Just boot tethered right now' after each REBOOT/RESTART of your system to put your iDevices in 'Jailbreak State'..