How To JAILBREAK 4.2.1 iOS Greenpois0n RC5 UNTETHERED | ALL iPhone, iPod Touch, iPad

Discussion in 'Apple iPad News' started by PhilSynowiec, Feb 4, 2011.

By PhilSynowiec on Feb 4, 2011 at 8:04 AM
  1. PhilSynowiec

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    Jul 10, 2010
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    This video will show you how to Jailbreak iOS 4.2.1. I have added some troubleshooting tips and have attempted Greenpois0n multiple times using this method. It worked for me, so as long as you follow the steps very carefully, you should be okay.

    Supported iDevices:

    - iPod Touch 2G (all bootroms)
    - iPod Touch 3G
    - iPod Touch 4G
    - iPad 1G
    - iPhone 3Gs (all bootroms)
    - iPhone 4
    - iPhone 4 Verizon (_not_tested_)
    - AppleTV 2

    Make Sure:
    - Your Device is restored to 4.2.1 CLEAN DFU (except those preserving baseband)
    - You have Greenpois0n from the official source or one of the mirrors below
    - Anything that blocks connections in or out should be turned off or allowed for Greenpois0n (like Little Snitch)
    - You have internet connection

    Other things:
    - My phone was activated with an AT&T Sim card
    - Sync'd to a new profile on iTunes

    1. Restart your Mac
    2. Plug in your iDevice after your Mac has restarted
    3. Kill iTunes if it opens
    4. Open Greenpois0n RC5 2
    5. Hit Jailbreak and get ready
    6. Follow the on screen instructions for DFU mode, make sure you do them on time!
    8. You should be Jailbroken with the Loader app on your homescreen
    9. Open up Redsn0w
    10. Find your 4.2.1 iPSW
    11. Click Next
    12. Check mark INSTALL CYDIA
    13. Contine the steps of Redsn0w
    14. Your device will reboot and now your are Jailbroken on 4.2.1 with Cydia!

    Things You Need:
    - Greenpois0n Read Me(just to read): #1527535 - Pastie
    - Greenpois0n RC5 2 *UPDATED*:
    greenpois0n OSX RC5 (mirror)
    Download greenpois0n OSX RC5 from - send big files the easy way (mirror)
    - Redsn0w &4.2.1 Firmware: iPhone Downloads
    - (OFFICIAL)
    #1 PhilSynowiec, Feb 4, 2011
    Last edited: Feb 4, 2011


Discussion in 'Apple iPad News' started by PhilSynowiec, Feb 4, 2011.

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