Greenpois0n Untethered Jailbreak For iOS 4.2.1 Released!


Update 4/5: Greenpoison for Mac updated to RC5.4. Click here to download. Also, Greenpois0n for Windows released! Click here to download RC5.4.

Update 3: Greenpois0n RC5.2 released! Official link is here. Unofficial download links here or here.

Update 2: Are you on tethered 4.2.1 via redsn0w? You can just jump straight into greenpois0n to untether your jailbreak, as posted by MuscleNerd:

Yes, tethered 4.2.1 redsn0w JBers can just run #greeenpois0n over it for untether (restore only if you have problem)

Update 1: What about PwnageTool? MuscleNerd just tweeted the following:

We’ll update PwnageTool with this 4.2.1 untether if we get the okay from cdev. Good job @pod2g and @chronicdevteam!

Tonight, the Chronic Dev-Team released the latest version of Greenpois0n, the popular iDevice jailbreaking tool.

The latest version features an untethered jailbreak for iOS 4.2.1. This means that users who jailbreak with Greenpois0n will be able to turn their iDevice off and on without having to tether their device to a computer upon reboot to properly use the device.

In other words, this is huge for those (me) who have been on iOS 4.1, waiting patiently for an iOS 4.2.1 jailbreak.

Note that the tool is for Mac ONLY. Also note that the exploit in this version of Greenpois0n has already been patched in iOS 4.3.

Click here for our iOS 4.2.1 jailbreak guide with Greenpois0n.

Official link is here for RC2. Unofficial download links here or here.


  • Weebsurfer


    A Windows Chump. 😉

    Good news. Can’t wait! Thanks!

  • updated to 4.2 finally. Was going to wait till 4.3 but i dont need unlock so whatever.

  • Cshupe2

    not working when u click on windows says cannot fin url

  • Earthworm Jim

    What!? Mac only?! after all this time it’s only for Mac?? Don’t they already have an untethered JB for 4.2.1 via redsn0w??

  • Cshupe2

    no wonder its not for windows! this has been out for weeks for macs

  • The original reports only showed and osx version, and as of now can’t download the win version.

  • Michaelpagliaro

    Won’t work after dfu mode message says could not mount? What’s this mean?

  • Smitjay

    Having issues with it on iPhone4…hangs…

  • Pagz

    does this work for iPad too?

  • Nick

    Is that during the jailbreak? Or is your iPhone freezing once jailbroken ?

  • Smitjay

    The Jailbreak itself is hanging…I am doing a complete restore to see if that helps the jailbreak work.

  • Mohammed

    Great, waiting fir the Win version

  • Mohammed

    It should

  • Remember you have to update to 4.2 first, so you will loose your unlock and jailbreak. if you need unlock do not do this.

  • ben

    I can’t get it to.

  • Neee

    YESS!!!! *scrolls down…* crap. Windows!! FUUUU…..

  • Michael

    Yes same not working it hangs on iPad black screen with text at top says can’t mount or something.

  • infm5

    i guess you are as uniformed as some people at MMi.

    Redsn0w was for people with 4.2.b3 SHSH saved via Cydia or tiny umbrella. This poses a problem for people who got their iphones with 4.2.1. already installed, there for will not have the required SHSH on cydia

  • ok just used it, and in really small letters it says install complete. Not seeing cydia or anything else.

  • Anonymous

    Nicely done but I’ll just wait for 4.3 to update and stick with 4.1 for now. Hopefully it will only be a week or two before it goes Gold.

    And also hope that Apple doesn’t patch this untethered exploit before 4.3 goes live

  • actually did it again and it hangs. had to reboot it.

  • they probably will, but they have a new one in mind for 4.3.

  • they probably will, but they have a new one in mind for 4.3.

  • Anonymous

    Fuuuuuuuuuuuuuuuuu WINDOWS ;___________________;

  • Nick

    Cool let me know if that fixes it

  • Guest

    I like turtles.

  • mwong

    haha! macs! …well actually have both, so its convenient =D

  • Anonymous

    So can you unlock with ultrasnow?

  • Brad

    damn! evertime i download the file it says fatal error: end-of-central-directory signature not found.
    the file is only 332kb, is that how big everyone elses is?

  • Brad

    Nevermind, just used the first link instead of the second and it opened fine! file was 1.0 mb this time

  • Pagz

    Anyone else taking Cydia forever to download from loader?

  • mwong

    Might sound like an idiot~ so apologize beforehand, but once it says in MINISCULE letters that Greenpois0n is initalized, I should just wait until something happens? = it already says complete on the app window on my mac. Dun dun dun~

  • ROAR

    windows version should be coming soon~~~

  • Annamaaae

    alright. I don’t know what to do. My iphone is not jailbreaking at all. It’s just stuck on the Greenpoison initialized part. I try and wait and hold on the home button but it’s not working. SOMEONE HELP ME PLEASE!!!!!!!!!!!!!!

  • SF

    would it matter if I jailbreak using my friend’s Mac and then use my personal windows machine to sync with itunes?

  • Ex


  • Nick

    Did it ever work for you? Or is your phone stuck in that state

  • James00

    When does everyone think the windows version will be released? This weekend? Or should I sneak into a future shop and use a mac in there?

  • Ex

    That would be so epic.

  • Anonymous

    Do it…! It only takes a few mins too lol

  • IPhoney

    The main Greenpois0n site has been down, and no Windows version. Fail!

  • BigD

    Open finder on your computer and under devices choose your hdd name, you will see an ibss file and cache file so just delete those, reboot your computer and try Greenpois0n again.

  • AnonymousGuy

    Windows version should be out this Sunday. Or yeah, just drop by your local FS. I am sure there is already a big lineup of people their wanting to do the same thing.

  • haha, why not at the apple store directly LOL,