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Greenpoison Jailbreak 4.2.1 Untethered – Tutorial

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Chronic Dev Team has released Greenpoison Jailbreak RC5 for iOS 4.2.1 Firmware Untethered on Windows – Linux and Mac OS. Latest release of GreenPoison can jailbreak your iphone 4 3GS ipod touch 4 3G 2G and ipad without the need of 4.2b3 SHSH Blobs as required on RedSn0w 0.9.6b4  4.2.1 Tethered Jailbreak.

grenposion jailbreak 4.2.1 iphone 4Please don’t forget to Upgrade your iOS Firmware Safely to 4.2.1 preserving your unlocked baseband 1.59.00 and then unlock your phone via UltraSnow Unlock Tool. Follow the step by step tutorial below to jailbreak your phone using Greenpoison RC5.

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#Tip : You can also find the GreenPoison 4.2.1 Video Tutorial handy while following the steps below.

Steps to Jailbreak iPhone 4 4.2.1 with Greenpoison :

  1. Download Greenpoison RC5 for your Computer [Mac - Windows]
  2. Unzip the downloaded file on your desktop and launch the application
  3. Connect your Iphone 4 3GS iPod Touch 4 and iPad to your computer and turn it off . Click on Jailbreak button on the Greenpoison app .
  4. Greenpoison app will now show on-screen instruction to put your device in DFU Modegreenpoison Jailbreak 4.2.1
  5. You will now be prompted to press and hold the sleep button for 3 secs [image below] greenpois0n Jailbreak ios4.2
  6. After 3 seconds continue holding the sleep button and press the Home button for the next 10 seconds .
  7. Now release the sleep button after 10 seconds have passed. Keep holding the Home button for next 15 seconds before your device goes into DFU Mode and the jailbreak process will begin automatically . [try this two-three times to perfect the timing] . Allow the process to complete . It will now show some codes running on your device. jailbreaking greenpoison 4.2.1
  8. After the Greenpoison tool has completed the jailbreaking process , close the app and look for green Loader Icon on your device[image below].
  9. Tap on the Loader Icon and install Cydia . cydia install

You have now jailbroken your iphone 4 on iOS 4.2.1 using Greenpoison . If you find any difficulty while following the above tutorial , Feel free to ask your question in the Jailbreak Forum . No Registration Required .

Update – No Cydia :

Many users are facing No Cydia after having successful jailbreak . For them use Redsnow to rejailbreak and only use the install cydia option. This will give an untethered jailbreak via Greenpoison and redsnow to fix cydia problem.

Special Thanks to our reader RinoRat for the tip .

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