Jailbreak iOS 4.2.1 Untethered for all iOS devices using Greenpois0n (Greenpoison) RC5-B2

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Chronic dev finally released the much awaited Greenpois0n tool that can jailbreak all iOS devices untethered on 4.2.1. It works on iPhone 4, 3GS, iPod Touch 2G, 3G, 4G, iPad and Apple TV. It does not require any shsh blobs to be saved.

It is recommended to restore your iDevice to stock 4.2.1 first. However, this will update the baseband. If you have iPhone 4 and need unlock, stay away from this.

greenpois0n greenpoison jailbreak ios 4.2.1 untethered for iphone 4 3gs 3 ipod touchHere is the step by step guide:

  1. Download Greenpois0n: Download for Mac and Windows
  2. Open GreenPois0n and click on jailbreak buttongreenpois0n for mac ios 4.2.1 untethered
  3. Follow the onscreen instructions to put your iDevice in DFU mode. Once it is complete, Greenpois0n will start jailbreaking your device.
    Note: You’ll get some errors initially but it should continue in a few seconds. If not, then start the whole process again.
  4. Your iDevice should be jailbroken. There should be a “loader” icon on your homescreen. Open it and install cydia.

Thats it. Enjoy the untethered jailbroken iPhone running iOS 4.2.1. :)

Update: Greenpois0n RC5 for windows released: Download Greepois0n for windows

11 Responses

  1. Tobi123tobs says:

    Hey, great news! My Iphone has already a tethered jailbreak. Do I have to install the orignial 4.2.1 before using this untethered jailbreak? Or can I jailbreak my tethered Iphone with this untethered jailbreak from Greenpois0n?

  2. Tobi123tobs says:

    thx, I have a IPhone 4, but I don´t need to unlock it ! ok, then everything again… restore… jailbreak, install cydia, installous… I hope that all the downloaded games come back again :) but I have everything saved in itunes, so don´t worry be happy :)

  3. Tobi123tobs says:

    thx, I have a IPhone 4, but I don´t need to unlock it ! ok, then everything again… restore… jailbreak, install cydia, installous… I hope that all the downloaded games come back again :) but I have everything saved in itunes, so don´t worry be happy :)

  4. Tobi123tobs says:

    hmmm, ok…but only 4 Mac as I see now!?

  5. Tobi123tobs says:

    ok, great :) good way to start in a lazy sunday :)

  6. Tobi123tobs says:

    it works, great :)

  7. Anonymous says:

    Do you loose your unlock with greenpoison 0n 3gs 4.2.1

  8. Paintedheart_15@yahoo.com says:

    hello :) what if my iphone needs to unlock. can i still used this green poison? thanks :)

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