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Thread: 3GS Updating 3.0 to 4.0 and above

  1. #1
    Question 3GS Updating 3.0 to 4.0 and above
    I have a 3GS with 3.0 firmware and 04.26.08 Baseband. It is a US phone that I need to be unlocked since I'm not in the US now.

    I'm looking into updating it to 4.0 and above. Which firmware is best?

    I have looked into this link http://modmyi.com/forums/3g-s-downgr...4-0-4-1-a.html . I still can't decide or don't know what the steps are in detail.

    I have used Tiny Umbrella 4.33.02 on the Mac and have received these saved SHSHs :
    3.1 (7C144)
    3.1.2 (7D11)
    3.1.3 (7E18)
    4.0 (8A293)
    4.0.1 (8A306)
    4.1 (8B117)
    4.2.1 (8C148a)

    From reading that link, it seems best to go to 4.1 since you can downgrade to 4.0.1?

    Do we have to use redsn0w to upgrade or can we use Pwnagetool?

    Thank you.

  2. #2
    Livin the iPhone Life
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    4.2.1 is a good stable iOS. Use Pwnagetool or Snowbreeze to create a custom firmware. A cfw is required to keep your unlock.

    My 3GS was @ 3.1.3 / 4.26.x BB and wanted to go to 4.2.1. So I first updated to a stock 4.0.2 to get the BB updated to 5.13.x (the latest that works w/ultrasnow), then updated with a Pwnagetool custom firmware to 4.2.1 and activated with an official SIM. I'm happy. It's been solid for several months.

    Note: with a custom firmware and SHSH blobs you can update / downgrade with very few issues. Stay away from 5.x

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    misterdobi (2011-08-11)

  4. #3
    Is there a way for me to update to 4.0.1 from Pwnagetool using the steps you just mentioned?

    Thanks.

  5. #4
    Livin the iPhone Life
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    Sure. The same Pwnagetool works with both

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    misterdobi (2011-08-11)

  7. #5
    I use the tutorials on iClarified. I couldn't find Pwnagetool working with 4.0.1. I see it working for 4.0 and 4.1. I'm gonna go ahead and try that first.

    Thanks.

  8. #6

  9. The Following User Says Thank You to Mes For This Useful Post:

    misterdobi (2011-08-17)

  10. #7
    I have an iphone 3Gs with ios 3.1.3 (7E18) with baseband 05.12.01
    my phone is jailbroken and unlocked. I would like to update my ios to 4.2.1 since i have been told that the later versions will update the baseband and crash the phone. I need to know first how to update to 4.2.1 instead of 4.3.5 and also which jailbreak to use.. I am new at this so i sort of need steps to how to do this.. any help?

  11. #8
    Livin the iPhone Life
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    @Nadine fareed:
    To update to 4.2.1 and KEEP the unlock, two (2) things are required:
    1) Always build and load a custom firmware with Pwnage or Sn0wbreeze
    2) SHSH blobs (see Tiny Umbrella) are required for iOS 4.2.1

    Please read the links in my signature for important information.
    It's not difficult, but it is important to know what to do and why before starting.

    When you're finished reading ... post a 'New Thread' for better exposure.

  12. The Following User Says Thank You to Mes For This Useful Post:

    misterdobi (2011-08-17)

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