3G on 4.1 unlock ?

Discussion in 'iPhone Forum' started by Rindless, Nov 29, 2010.

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  1. Rindless

    Rindless
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    I have a 3G on 3.1.3 (baseband 05.12.01) currently unlocked with UltraSn0w and want to update to 4.1 (as most Cydia apps are probably not ready for 4.2.1).

    ShSh are saved on Cydia.

    Question is, can I update to 4.1 and unlock with UltraSn0w or do I have to update to the official 4.2.1 (to get the new UltraSn0w unlock) ?


    Finally, is is possible to update to update to 4.1 while preserving the current 05.12.01 baseband ?
     
  2. jayse

    jayse
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    you can upgrade to 4.1, but as you've mentioned, it will upgrade the baseband and re-lock the phone.

    I've seen guides to do this upgrade and preserve the baseband on an iphone 4, but not on a 3g or 3gs.
     
  3. bjarvis2785

    bjarvis2785
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    Here's one way to do it (using the iPad baseband upgrade)

    assuming you are running windows, you need...

    This IPSW: http://appldnld.apple.com/iPhone4/061-7932.20100908.3fgt5/iPhone1,2_4.1_8B117_Restore.ipsw
    Redsn0w: http://sites.google.com/a/iphone-dev.com/files/home/redsn0w_win_0.9.6b5.zip?attredirects=0&d=1

    • Download both files above.
    • Restore via iTunes to the IPSW above (Hold Shift while clicking 'Restore' in itunes, then navigate to wherever you downloaded the 4.1 ipsw to).
    • Once done, close itunes, turn off iphone, and start redsn0w.
    • Point redsn0w at the 4.1 ipsw - let it do it's thing for a couple of seconds
    • It will then give you a few check boxes - make sure you tick the 'ipad baseband' option
    • Click next and follow onscreen instructions.
    • Let redsn0w do it's thing, then the phone will go nuts and start flashing the new firmware and update you on how it's doing.
    • you will eventually have an iphone with 4.1 but locked.
    • follow this guide: iClarified - iPhone - How to Unlock the iPhone 4, 3GS, 3G Using UltraSn0w for the unlocking process.

    This is the exact procedure i followed this morning and am now running 4.1 with no probs.

    HTH :thumbsup:
     
  4. Woody26

    Woody26
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    me too, i did mine exactly the same today
     
  5. henlowstu

    henlowstu

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