OS4 from 3.1.2 ...

Discussion in 'Jailbreaks and iOS Hacks' started by Emanuele, Jul 12, 2010.

  1. Emanuele macrumors member

    Nov 8, 2007
    Hi all....

    sorry but I dont have the strength - as I lay in bed with the flu - to read all the posts about this so here is the question.

    I have the 3GS version 3.1.2 (7D11) - jailbroken and unlocked using Blackrain - baseband 05.11.07
    Bought this in US but now in Italy.

    I want to upgrade to OS4 and unlock again so I can use my local SIM card.

    Can I do this, and where the most used - successfull- guide?

    Thank you,
  2. mreddys10 macrumors regular

    Jul 29, 2008
    Does your 3GS have the old bootrom (untethered JB) or is it a new bootrom (tethered JB, have to use blackra1n to restart the phone)?

    If its untethered, you can use pwnagetool to make a custom firmware and update. Go and look for the tutorial at iclarified.com.

    If its a tethered JB, then its more complicated. ih8sn0w has released a tutorial for a tethered 4.0 JB, but it is not for average users. If you are still interested, the head over to ih8sn0w forums, and search for the tutorial (sorry, I dont have a direct link).
  3. Benji222 macrumors 65816


    Dec 21, 2009
    So Cal
    I think you have to cerate a custom OS4 ISPW using pwnage tool.
    I would say google is your friend.
  4. Emanuele thread starter macrumors member

    Nov 8, 2007
    thanks guys,

    no, it is not a tethered jb.
    I'll look at iclarified then.
  5. gixxerfool macrumors 6502a


    Jun 7, 2008
    Thelatinist has a thread on here that addresses this very thing. Waded through it yesterday. There's a very handy flow chart in the first post that should help. Essentially, download pwnage tool (mac only) find a restore IPSW OF 4.0 and go to you tube and watch all the pertinent videos. Just remember to select activate this phone in pwnage tool. After the FW is built open iTunes hit option+restore browse for the custom IPSW and let her rip. After that unlock with ultrasn0w.

    If I missed something please feel free to add/correct. Hope this helps.
  6. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.
    You can restore to custom 4.0 ipsw created with pwnage tool.

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