GreenPois0n Untethered Jailbreak for iOS 4.2.1 Download Available

Feb 3, 2011 - 44 Comments

greenpois0n untethered jailbreak 4-2-1

The latest version of Greenpois0n has been released for download, it offers an untethered jailbreak for iOS 4.2.1. The Mac and Windows release come as GreenPois0n 1.0 RC5, with a Linux version due out soon.

Download GreenPois0n Untethered Jailbreak for iOS 4.2.1

If the initial download link does not work, be sure to try one of the mirrors.

We will update download links when they become available for all platforms.

Follow our how to jailbreak iOS 4.2.1 untethered with GreenPois0n 1.0 RC5 guide if you need assistance.

As usual, backup your iPhone before proceeding. If you are currently using a tethered jailbreak like redsn0w, you should restore before jailbreaking again with GreenPois0n 1.0 RC5.

Update: For those encountering a problem where the app stalls on “initialized”, you can download GreenPois0n RC5 2 to resolve this.

Update 2: The Windows version of GreenPois0n Untethered will be released tomorrow or the next day, according to p0sixninja. We will update download links for all versions of GreenPois0n as they are available.

Update 3: GreenPois0n RC5 for Windows has been released. It supports the untethered jailbreak for iPhone, iPad, iPod touch, and Apple TV2, running iOS 4.2.1.


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Posted by: Manish Patel in iPhone


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  1. Yuvraj says:

    I try to jailbreak my iPod touch 2g(4.2.1) with greenposion but it says failed. How I do that my iPod jailbreak with greenposion

  2. elijah says:

    what do you do after you download it

  3. mario says:

    how do you do this for ipod touch?

  4. mario says:

    how do you do this? please explain.

  5. cody says:

    I downloaded the green poison software for 4.2.1. and it worked but the only problem is it wont let me go to cydia wat am I supposed to do now

  6. Tristan says:

    How long does it take to jailbreak my iPhone 3gs?

  7. Mario says:

    Can somebody please help me jailbreak my iPhone 4.2.1 3G I been trying to do it for so long now am getting really ticked off because I bought a game on the app store and it say the game not compatible for my iPhone

  8. […] 2G just hit upgrade in iTunes and jb it with Redsn0w. Edit: or greenpois0n. That might be easier. GreenPois0n Untethered Jailbreak for iOS 4.2.1 Download Available Forum Rules | Jailbreakability Table | Quick JB Tutorials (iPhone 3G/3GS/4) | TinyUmbrella […]

  9. d says:

    ive tried a 1000 time keeps putting it back in restore mode. yes I have turned off fire walls/antivirus running xp i have new verizon 4 4.2.1. Any love would be appriciated??

  10. Todd says:

    ive downloaded the greenpoison RC5 and RC6 and did the DFu but after every time i do it is says try again – someone please help!!!

  11. Bob says:

    I want it so badly! BTW My name isn’t bob :)

  12. Fernie says:

    I have a unlocked/jailbroken iphone3 with cydia, can i still download this green poison for my phone?

  13. CKJD says:

    Do you have to have your ipod backed up to jailbreak with this

  14. sailly says:

    i install cydia using green poison ios 4.2.1 on my iphone 3gs. everything is ok BUT inserted t-mobile SIM it dosent work, did i miss some step or what else i have to do. please help. thanks.

  15. CKJD says:

    i cant get mac version to download it says i dont have an application to open it with

  16. FRANK says:

    Hi Rapompo the web page you need two type in is. Yes you have two download and save the program called gp_win_rc5_b2 (4).zip file.

  17. Tim says:

    I just went thru the steps and do not see the ICON on my phone when its done.. I run Windows and have an iPhone 4 with OS 4.2.1

  18. […] Download GreenPois0n RC5: (Mac version) (Windows version) […]

  19. Rapompo says:

    i’m trying to download the Greenpois0n but the website request me to buy the WinZip at £25, can some1 pls help me

  20. FRANK says:


  21. Ihsan Faisal says:

    And… where will the linux version available?

  22. Sean says:


  23. Sean says:

    It is just released like 3 minuits ago. the website wouldn’t load for like a minuits because they were updating it. the linux version is still yet to be released.

  24. Matt says:

    when will green poison come out for windows????

  25. […] is your thing.As always, be sure to backup your device, and proceed at your own risk.Article via OS X DailyAbout Stephen HackettStephen Hackett, formerly a Lead Mac Genius at Apple, now spends his days […]

  26. […] リリースの噂もありましたが、昨日突然 GreenPois0n RC5 がリリースされました。Untethered Jailbreak iOS4.2.1 […]

  27. […] RC5 2 has been released, the update to 1.0 RC5 aims to fix an initialization error that some users reported. The “initialized” error […]

  28. D1veBum says:

    The file on the MediaFile site is crap and hangs!

  29. […] Update: A new version has been made available, Download GreenPois0n Untethered Jailbreak for iOS 4.2.1 […]

  30. Abhi says:

    When will the WINDOWS version release>>??

  31. […] Download GreenPois0n untethered jailbreak […]

  32. Manish says:

    Mirror 2 seems most reliable at this point.

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