Jailbreak iPhone 3GS, iPhone 4 Untethered on iOS 4.2.1 Using Greenpois0n (Windows)

The Chronic Dev Team has already released the latest version of its Greenpois0n jailbreak both for Mac and Windows users.

Greenpois0n RC5 is capable of jailbreaking iOS 4.2.1 untethered on the following devices: iPhone 4, iPhone 3GS (all bootroms), iPod Touch 2G (all bootroms) iPod Touch 3G, iPod Touch 4G, and the iPad. You can check the articles below to learn more about the latest release of Greenpois0n.



Greenpois0n RC5 for Mac OS X

Greenpois0n RC5 for Windows



What to do first:



Before jailbreaking your iPhone, you need to have a backup of your device using iTunes. To do that, simply follow the steps as instructed below.

1. Connect your iPhone to your PC.

2. Launch iTunes.

3. On the left pane of iTunes interface, you will see list of devices connected. Look for your iPhone.

4. Click on your iPhone, right-click, and select Back Up.



Now you’re done backing up your iPhone.



Important Note:



When you jailbreak your iPhone, you have to accept the fact that you void Apple warranty. That is, though I guarantee this tutorial will absolutely work, you still have to do this at your own risks. If you need a baseband unlock for your iPhone, you should not proceed to upgrading your iOS to 4.2.1 immediately.



iPhone 4 users should note that when you upgrade to iOS 4.2.1, your modem firmware or baseband will be updated also from 1.59.00 to 3.10.01. The same thing with iPhone 3GS users, your baseband will be updated from 5.13.04 to 5.15.04. I will reiterate once again that the baseband that comes with iOS 4.2.1 are not unlockable, just yet. The workaround on upgrading to iOS 4.2.1 without updating your unlockable baseband is to use the latest version of TinyUmbrella. If you have a question on how to do that, just leave a comment below.



How to Jailbreak iPhone 3GS and iPhone 4 on iOS 4.2.1 using Greenpois0n RC5:



In this tutorial, I’m using an iPhone 4 in the process which is also applicable to iPhone 3GS users. Current baseband is 2.10.04 in which using TinyUmbrella is not necessary anymore since I don’t need my iPhone 4 to be unlocked. You probably have the same baseband if you got your iPhone 4 already installed with iOS 4.1.



So here we go…



1. Download iOS 4.2.1 directly from Apple server. Check specific download links below.



iPhone 3GS iOS 4.2.1

iPhone 4 iOS 4.2.1



If you’re already using iOS 4.2.1, proceed to step 3.



2. Upgrade your iPhone firmware to iOS 4.2.1 using iTunes. Again, use the latest version of TinyUmbrella if you want to preserve your unlockable baseband.

Upgrading firmware to iOS 4.2.1 using iTunes

To upgrade your firmware using iTunes, connect your iPhone to the PC and select your device on the left pane of the iTunes interface. In the Summary tab, hold Shift-key on your keyboard and click Update. And then locate your downloaded iOS 4.2.1 to start the firmware upgrade. (Don’t worry; iTunes will do all the rest of processes here.)



Note: It's always best to restore fresh iOS 4.2.1 before doing the jailbreak, particularly if your device is jailbroken with the iPhone Dev Team's Monte (the one used in Redsn0w jailbreak).



3. Download the latest version of Greenpois0n. You can find direct and mirror download links from this post: Greenpois0n RC5 for Windows



4. Unzip Greenpois0n RC5 to any folder you want.

5. Launch Greenpois0n application.

6. Connect iPhone to your PC. And then power it off.

7. Click “Prepare to Jailbreak (DFU)” in the Greenpois0n interface. Follow the instructions on the Greenpois0n interface to put your iPhone in DFU mode. Here's a video I recorded on how to do that.







You will be asked to:



7.a Press and hold the Sleep button for 2 seconds.

7.b Press and hold Home button for 10 seconds, while continue holding Sleep button.

7.c Release Sleep button, and continue holding Home button for 15 seconds.



If you failed to follow the instructions correctly, don’t worry. It won’t mess your iPhone. You will be asked to try it over and over again until you successfully put your device in DFU mode.



8. Once your iPhone is already in DFU mode, hit the “Jailbreak” button.

Greenpois0n will now start the jailbreak process.



9. Once jailbreak is complete, just click the “Quit” button.

Verbose text as seen during jailbreak process

You should see text scrolling on your iPhone screen in verbose mode and your iPhone will reboot.

There you can see a new Loader application on your iPhone’s Home screen.

10. Tap on the Loader icon to launch the app. Select “Cydia” and tap “Install Cydia” button to install. Your iPhone will start downloading Cydia files at this point.

Once Cydia is already installed, you can remove the Loader app as you don’t need it anymore. To do that: just select Options button, and then tap “Remove Loader.app” button to uninstall.

Congratulations! Now you have an “untethered” jailbroken iPhone on iOS 4.2.1. You should reboot your iPhone and launch “Cydia” from the home screen. Finally, install the latest updates.



If you follow this detailed guide thoroughly, you would be able to successfully jailbreak your iPhone on iOS 4.2.1 using Greenpois0n RC5. Good luck and extend your thanks to the Chronic Dev Team!



For unlockers:



If you need to unlock the baseband of your iPhone 4, follow this guide: How to Unlock iPhone 4 Baseband on iOS 4.2.1.



If your iPhone 3GS has been accidentally upgraded to iOS 4.2.1 and also updated the baseband to 05.15.04 which is not unlockable by Ultrasn0w for the time being, your only hope is to upgrade the baseband to 6.15.00 which is unlockable by Ultrasn0w. Check how to Unlock Baseband 5.15.04 on iPhone 3GS Running iOS 4.2.1.

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Greenpois0n iOS 4.2.1 Untethered Jailbreak for Windows Available for Download!

Here is it iPhone jailbreakers! The Chronic Dev Team just released the Windows version of the Greenpois0n untethered jailbreak for iOS 4.2.1.

Greenpois0n RC5 for Windows support the same devices as the Mac version. You can download it directly from the GP website or via this alternative link.

I’ll be posting a tutorial on how to untethered jailbreak your iPhone on iOS 4.2.1 using this latest version of Greenpois0n, so just stay tuned!



Update: Detailed guide on how to jailbreak iOS 4.2.1 on iPhone 3GS and iPhone 4 has already been posted.



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Greenpois0n Untethered Jailbreak for iOS 4.2.1 (Mac Version) is out!

It’s only a matter of 2 weeks waiting since the Chronic Dev Team hinted us that they are coming back to the jailbreaking scene with an updated version of its Greenpois0n capable of jailbreaking iDevices on iOS 4.2.1.



@P0sixninja of the Chronic Dev Team announced that the latest version of Greenpois0n (RC5) is now available for download. However, the first release is only for Mac users and is still on the Beta stage. Windows users may need to wait a little more time while the Dev Team is still working on it.

Greenpois0n RC5 can jailbreak iPhone 4, iPhone 3GS, iPhone 3G, iPod Touch 4G, iPod Touch 3G, and the iPad – on iOS 4.2.1 untethered. Unlike the iPhone Dev Team’s Redsn0w 0.9.7 jailbreak, the Greenpois0n jailbreak won’t need the iOS 4.2 Beta 3 SHSH blobs along the process. P0sixninja also reiterated that Greenpois0n RC5 doesn’t support hactivation, which means you have to hactivate your device through iTunes. He also added that the latest version of Greenpois0n has already been patched on iOS 4.3.



Please note that Greenpois0n needs your iPhone to have iOS 4.2.1 installed and for iPhone 3G and 3GS users, your baseband will be updated to 5.15.04. If you need baseband 5.15.04 unlocked, I strongly suggest to stay away from upgrading to iOS 4.2.1. The iPhone Dev Team has a tricky way of upgrading baseband 5.15.04 to iPad baseband 6.15.00 and finally unlocking it; however it uses the Redsn0w tool and there’s no way the Chronic Dev Team’s Greenpois0n can do that, just yet.



Greenpois0n RC5 for Mac can be downloaded from this link (original site); however it may still continue encountering too much server loads for the time being. Thanks there’s a mirror download link as an alternative.



Update: Greenpois0n RC5 for Windows is also available for download.

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Greenpois0n iOS 4.2.1 Untethered Jailbreak by Chronic-Dev Team, Coming Soon

While the iPhone Dev Team is still on its beta testing for Redsn0w 0.9.7, which is capable of jailbreaking iOS 4.2.1 untethered – the Chronic Dev Team is back into the game with an updated version of its popular jailbreaking tool, Greenpois0n, which initially uses the Limera1n exploit discovered by Geohot to jailbreak iOS 4.1 untethered.



The new updated version of Greenpois0n is capable of jailbreaking iOS 4.2.1 untethered, but unlike Redsn0w – it won’t require users to have the iOS 4.2 beta 3 SHSH blobs saved. The video below is a demo of an iPhone 4 running a jailbroken iOS 4.2.1 untethered.







The Chronic Dev Team didn’t provide ETA as to when this untethered jailbreak will be released, but surely we’ll let you know once this good news for jailbreakers progresses. Stay tuned!



Update:



Greenpois0n Untethered Jailbreak for iOS 4.2.1 (Mac Version) is out!

Greenpois0n iOS 4.2.1 Untethered Jailbreak for Windows Available for Download!

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