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  1. Thread AuthorThread Author   #1  
    ferraristef's Avatar
    iPhone Beginner

    92 Posts
    Global Posts
    148 Global Posts

    Default Upgrade from 4.0 to 4.2.1?

    Hey guys! Currently I have an iPhone 3gS on 4.0 jailbroken with jailbreakme.com. I was thinking up gradin to 4.2.1 and jailbreak with greenpoison because now it's an untethered jailbreak? So how would I update? Just plug it in and click update and rejailreak? Or hold option restore ( I think?) to upgrade to 4.2.1.


  2. #2  
    jdavis530's Avatar
    iMore Expert

    855 Posts
    Global Posts
    941 Global Posts


    Plug into itunes, click upgrade. That will upgrade you to 4.2.1 and remove you previous jailbreak. Then you can jailbreak again with greenpois0n, but remember greenpois0n jailbreak for 4.2.1 currently is only available to Mac users, no windows version yet. So if you have windows, and don't have access to a Mac, then I would hold off on the upgrading of your OS. Also, this greenpois0n is very new and is still quite buggy, you might want to take that into consideration as well.
  3. #3  
    Capnjackk's Avatar
    iPhone Intermediate

    103 Posts


    If you're going to upgrade to 4.2.1 you're gonna want to restore and upgrade. Greenpois0n works best on a clean restore.

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