GreenPois0n Untethered Jailbreak for iOS 4.2.1 Released

By , Feb 3, 2011

After weeks of talks, wait, and rumors, the Chronic Dev Team finally came through with the release of their GreenPois0n untethered jailbreak for iOS 4.2.1.

Up until now, there was no other solution but use a beta version of RedSn0w, which let’s be honest, wasn’t very stable. I don’t know if this release will be better than RedSn0w as there isn’t much information about this version of GreenPois0n so far.

All we know is that it works with the iPhone 3G, 3GS, and iPhone running iOS 4.2.1. Even better, unlike RedSn0w, you won’t need to have your 42b3 SHSH blobs saved in order for GreenPois0n to work. One thing is for sure, this version of GreenPois0n will not hacktivate your iPhone. So far, only a Mac version is available.

You can download GreenPois0n from our iPhone downloads section.

A tutorial should be up soon. If you give it a try, let us know what you think by leaving a comment below.

Want to know about a great app? Try Duet Display, an awesome app that turns your iPhone or iPad into an extra display for your Mac or PC. Get it now in the App Store.

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  • Beans

    yeah are you mad,
    of course you can install windows 7 on a commodore 64.. donkey kong then turns into king dong

  • KraftWiz


    For all you guys looking for an unlock for 4.2.1 with baseband 05.15.04., why not upgrade to 06.15. and unlock with ultrasnow ??

    Why is that such a big problem?

    If there is an unlock already available, why should the dev team work on another one ??

  • Beans

    if you update the baseband to 6.15 the GPS does not work and you need custom firmware to do a restore

  • bollucks

    Was using redsn0w and it was real buggy. Just reloaded with GreenpoisOn and all is good. Tested Cydia, and ibooks and no issues. Running iOS 4.2.1

  • iSmokilos

    The sleep button on my iPhone 3G is broken and I’ve been resetting my phone by the reset option in settings. Does anyone know if I could use this same reset technique to reset my phone during the beginning of the greenpois0n jailbreak?

    • cokyl

      used GP, but keeps crashing, and bad delay using touch screen

  • Matt

    So does greenpois0n work on iPods? Please excuse my “noobishness” and answer honestly.

  • steve

    all i want is a link so i can download greenpoison can any1 help me pls

  • Beans

    @Matt your first port of call should be from your ipod and if it does not work find out why and you will have your answer for greenpois0n

    link for greenpois0n =

    can someone please let me no the correct up to date procedure for tethered on iPhone 4 [4.2.1]

  • Eric

    Is there gonna b an unlock for 4.2.1, don’t wanna switch to iPod baseband….ultrasnow doesn’t work??? I need some help??

  • John

    Ok I have tried this with my iphone 3GS 4.2.1 about 8 times. My 2nd gen ipod has the same software and the first time I tried it the jailbreak went perfectly?? I really need it for my phone and not my ipod. Any ideas why this is happening? Help please!

  • Beans

    if you have tried to jailbrake your stuff and failed you need to do a system restore before you can jailbrake again with 4.2.1 firmware

  • blayden

    sorry guys but its not working for me it wont go in to DFU mode it is so annoing!!!!!!!!!!!!!!!!

  • Tom

    Use Red snow first install Cydia.. Open cydia, download the files.. Shut down, boot tethered.. Go back over it with GP.

  • jenjen

    Alright so i jailbroke my boyfriends iphone 3g on 4.2.1 with redsnow. the basband is not the ipad one and i tried to unlock it with ultrasnow and it just kept saying “searching” or “no service”. Do i have to upgrade his baseband to the ipad one?

  • Tom

    Clarify, why would an iPhone have a iPad baseband?

  • Beans

    that is a good question so if anyone has the answer please post it

    I have only managed to unlock the 3g by updating the baseband to 6.15 [iPad], please note this has some real negatives. If you update to iPad baseband for unlock purposes the GPS will no longer work in the phone [no tomtom] and if you need to restore the phone at any time you will need custom firmware. This means you will not be able to restore your phone unless you have a specific .ipsw file.

  • Ivan

    When i follow the intrusion and it sayed dfu failed can somebody help me.

    • Tom

      Use redsnow first

  • http://no mobark

    iAlright so i jailbroke my boyfriends iphone 3g on 4.2.1 with redsnow. the basband is not the ipad one and i tried to unlock it with ultrasnow and it just kept saying “searching” or “no service”. Do i have to upgrade his baseband to the ipad one?

  • cameron 91

    i cant go to my home screen during a phone call now

  • ReDnEcK

    what happends if u try it on an ipod??