Upgrade jailbroken 3GS to 4.0?

Discussion in 'Jailbreaks and iOS Hacks' started by lakshi, Jul 9, 2010.

  1. lakshi macrumors regular

    Feb 7, 2008
    I have a 3GS old bootrom jailbroken and unlocked on 3.1.3. I would like to know if I can now upgrade and jailbrake to 4.0 using sn0wbreeze?
  2. mreddys10 macrumors regular

    Jul 29, 2008
    Yes, you can use pwnagetool (recommended) or sn0wbreeze (not recommended) to create a custom 4.0 firmware and upgrade, as long as your phone has the old bootrom.
  3. thelatinist macrumors 603


    Aug 15, 2009
    Connecticut, USA
    This is true only if the OP used redsn0w or PwnageTool to jailbreak his phone. If he used Spirit, then he's out of luck unless he has 3.1.2 SHSH on file and can downgrade and pwn.
  4. lakshi thread starter macrumors regular

    Feb 7, 2008
    Ok thanks for the info
  5. scirica macrumors 68020


    May 13, 2008
    Dallas, TX
    I went from 3.1.3 jailbroken (pwnage) to 4.0 jailbroken (pwnage) on old bootrom. Works great, but as mentioned above, pwnage jailbreak needs to be your starting point.

    I could have upgraded my modem firmware as well but I chose to keep it at 4.26.08.
  6. larock macrumors member

    Jan 23, 2008
    Not true.

    Just this morning my 3GS (old bootrom) went from 3.1.3 jailbreak (Spirit) to 4.0 jailbreak (Sn0wbreeze). The key is to grab Spirit2Pwn off Cydia before using Sn0wbreeze.

    Works great.

    Click here for the guide I used.

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