Need some help re-unlocking a 3GS...

Discussion in 'Jailbreaks and iOS Hacks' started by Offspring992, Jun 8, 2010.

  1. Offspring992 macrumors member

    Joined:
    Jun 15, 2007
    #1
    I did a bit of Mroogle searches but I couldn't come up with the answers I'm looking for. Here's my situation:

    A friend of mine received an unlocked 3GS from her cousin last night. She is using it with T-mobile. This morning she synced with iTunes, and accidentally updated to 3.1.3. I suppose you can see where this is going... Since I am a bit more (way more) tech savvy than her, the task of getting it to work again is now placed in my hands. In order to make this work, I'm assuming the following steps need to occur:
    1. I need an AT&T SIM card so I can do a restore in iTunes. Right now when you connect it to iTunes, all I see is the invalid SIM error screen. This is no issue as my brother is mailing me an unused AT&T SIM card from his old iPhone, which is no longer in service.

    2. I'll need to downgrade from 3.1.3 to 3.1.2. I read a guide that describes this process as being a bit more difficult than in the past but it's nothing I won't be able to do.

    3. Jailbreak with the unused AT&T SIM using the Spirit Jailbreak tool.

    4. Unlock using whatever software is needed.

    I'm running 10.6.3. Does this sound logical?
     
  2. dhlizard macrumors G4

    dhlizard

    Joined:
    Mar 16, 2009
    Location:
    The Jailbreak Community
    #2
    When she updated to 3.1.3, the baseband was updated to 5.12.xx. The baseband cannot be downgraded in a 3GS.

    No unlock available for that right now.

    That will change when 4.0 is released to public.

    She will have to wait a couple of weeks.
     
  3. Daiden macrumors 6502a

    Daiden

    Joined:
    Feb 25, 2007
    Location:
    Chicago, IL
    #3
    Does she have a saved SHSH for 3.1.2 (either on Cydia or on her PC)? I believe that is needed to do any downgrading from the newest software.
     
  4. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #4
    That doesnt matter.
    She might be able to downgrade the firmware but not the baseband to unlock it.
    Just JB it for now.
     
  5. Speedracer04 macrumors 6502a

    Speedracer04

    Joined:
    Sep 8, 2006
    Location:
    Michigan
    #5
    I thought if you had your SHSH saved to cydia prior to upgrading you were able to downgrade your baseband? :confused:

    Dont know much about baseband downgrading though since Im on AT&T
     
  6. tctony macrumors 6502a

    tctony

    Joined:
    Jun 15, 2009
    #6
    You can't downgrade your baseband in 3GS. SHSH blobs allow you to downgrade firmwares if you have the same baseband.
     
  7. AsianChexMix macrumors regular

    Joined:
    Apr 9, 2009
    #7
    What has been the issue with the baseband that does not allow it to be unlocked? Is there any foreseeable issues with 4.0 when that is released or is that trying to predict the future and no one knows?
     
  8. Offspring992 thread starter macrumors member

    Joined:
    Jun 15, 2007
    #8
    It looks to be I was mistaken about the 3GS part. It's actually a 3G. I should have paid more attention. Given that, will this work?
     
  9. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #9
    Nope, same for a 3G also.
    Wait a few weeks for the new unlock after 4.0 is out.
     
  10. taki143 macrumors newbie

    Joined:
    Jun 9, 2010
    #10
    Forgot to back up my shsh blobs also

    I really need to get get back to 3.1.2!
    I have 3.1.3 with Base band 5.12.1
    iphone 3gs 16GB
    It has been jailbroken with Spirit but I can't carrier unlock it yet.
    Am i totally screwed? did I just buy an overpriced ipod touch?
    HELP PLEASE
     
  11. labman macrumors 604

    labman

    Joined:
    Jun 9, 2009
    Location:
    Mich near Detroit
    #11
    you forgot so yes you are screwed! and no matter how many times you guys ask you can't go back with baseband with a 3GS. Even if you did shsh it! again unlock should be here by the end of the month.
     
  12. dhlizard macrumors G4

    dhlizard

    Joined:
    Mar 16, 2009
    Location:
    The Jailbreak Community

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