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Thread: from 3.1.2 to 4.0 without losing unlock?

  1. #1
    Default from 3.1.2 to 4.0 without losing unlock?
    Hello (and maybe "Sorry")

    Firstly, I am sure this question must have been asked a few times already, I have been reading the Forum but cannot find a definative answer (or one perhaps that I understand?) I dont mean to be a noob or ask re-occuring questions, please dont flame me!!

    I have an iPhone 3G running 3.1.2 (7D11) firmware. When I bought the phone I used blackra1n to unlock it, allowing me to use the 02 network rather than the Vodafone it came with.

    Issues with wifi and the fact I dont feel I am getting the most from my phone means I would like to push it up to version 4.0.

    Can I do this, and unlock it still (easily?) If so how?

    I have seen a few threads that say upgrading to v4 is possible but unlock is lost, some say its possible but dont say how?

    Oh and modem firmware is 05.11.07 - I understand this may be required to be kept at this level.

    Many thanks for reading this far...


  2. #2
    Superbad Modder-ator Simon's Avatar
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    Nov 2007
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    You can use sn0wbreeze to make a custom 4.1 firmware and restore to that. This will preserve your baseband so that you can unlock again after the restore (use ultrasn0w now to unlock).

  3. The Following User Says Thank You to Simon For This Useful Post:

    andyo (2010-10-18)

  4. #3
    Retired Moderator iYeow's Avatar
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    Feb 2008
    Vancouver, Canada
    Thanked 2,764 Times in 2,652 Posts

    Do you have a valid sim card to activate ? if you do then it is better.
    Download Snowbbreeze 2.0.2 and download ireb 4.1 from here | Jailbreak your iPod touches and iPhones
    Download the official 3g 4.1 ipsw from here :
    iClarified - iPhone - Where To Download iPhone Firmware Files From
    Update your itunes to the latest first.
    Build your custom firmware from Snowbreeze and choose Expert mode > General > uncheck the activat my iphone.
    Build it and it will be named Snowbreeze_4.1.ipsw on your desktop
    Now run ireb 4.1 , it will put your iphone into DFU mode.
    Once that is donw, do a Shift + Restore to Snowbreeze_4.1.ipsw
    Put your official sim card to activate
    Once restored you are jailbroken at 4.1
    Unlock with Ultrasn0w again.

  5. The Following User Says Thank You to iYeow For This Useful Post:

    andyo (2010-10-18)

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