Upgrading firmware on 3GS

Discussion in 'Jailbreaks and iOS Hacks' started by tee7788, Dec 10, 2010.

  1. tee7788 macrumors newbie

    Joined:
    Sep 7, 2009
    #1
    Hi
    I currently have an iPhone 3GS unlocked on fw 3.1.3. My question is will I be able to upgrade to 4.0 by doing a shift-restore in iTunes or will I be forced to upgrade to 4.2.1? Reason I want to upgrade to 4.0 is because i want to be able to unlock. Thanks!
     
  2. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #2
    If you have the SHSH files saved for 4.0/4.0.1/4.0.2 you can upgrade in iTunes. If you don't your only option is to go to 4.2.1

    You can use PwnageTool to upgrade and preserve your baseband. You can even go to 4.1 if you those shsh files saved (but you have to use Pwnage).
     
  3. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #3
    Open Cydia and lok at the top of the page to see what SHSH's you have saved if any.
     
  4. tee7788 thread starter macrumors newbie

    Joined:
    Sep 7, 2009
    #4
    Thanks for the response. Since I've haven't upgraded to 4.0, I don't have any SHSH saved in cydia. Looks like I'll just have to wait for the 4.2.1 jailbreak and unlock.
     
  5. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #5
    You don't have to upgrade to 4.x.x to get the shsh. Once you click "Make My Life Easier" in Cydia, Cydia will then save the shsh blobs for the firmwares automatically.

    You don't have to be jailbroken to save the shsh either. If you're not jailbroken, you can use TinyUmbrella to save the blobs.
     
  6. MaxBurn macrumors 65816

    MaxBurn

    Joined:
    Nov 25, 2010
    #6
    Has pwntool been updated to do this on windows yet? I'm looking to do the same thing. Want to go to 4.2.1 but keep baseband. Isn't there a baseband check I read about, does pwntool get you around that?

    iPhone3Gs, iOS 4.0.2, modem 5.13.04, OLD bootrom*
    SHSH saved for 4.2b3 and 4.2.1 but nothing lower, this worries me a little. I don't even want to jailbreak in fear of hosing the phone and being forced to do an upgrade and lose the possibility of unlock.
     
  7. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #7
    No. PwnageTool is a Mac only software. If any of your friends or family has a Mac you can then use PwnageTool.

    Or, you can find a website you can trust that has a custom ipsw.
     
  8. MaxBurn, Dec 10, 2010
    Last edited: Dec 10, 2010

    MaxBurn macrumors 65816

    MaxBurn

    Joined:
    Nov 25, 2010
    #8
    Does devteam release these custom firmwares with a checksum? They seem to hint at this on their blog.

    Edit found one of what you are talking about on demonoid, not sure if I have the balls to try their firmware though. I think I would rather cook up a OSX in vmware to do it myself.
     
  9. tee7788 thread starter macrumors newbie

    Joined:
    Sep 7, 2009
    #9
    Thanks!!! I wasn't aware of that. I thought I only had SHSH saved for 3.1.3. I just did a successful "shift-restore" upgrade to 4.0.1 and jailbreak/unlock.
     
  10. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #10
    No problem:apple:
     
  11. dejeezu macrumors newbie

    Joined:
    Dec 11, 2010
    #11
    Inquiry along same lines

    Hi, I'm new here and decided to continue this thread instead of starting new one since it is so similar. I have the same, iphone 3gs old bootrom jailbroken on 3.1.3, hacktivated and unlocked 5.12.01 baseband. Have SHSH from 3.1 to 4.1. Also seeking upgrade path to latest jailbroken firmware possible (4.2.1 or 4.1) that is hacktivated/jailbroken/unlocked. As I had a nightmare of trial/error to get 3.1.3 hacktivated and unlocked without the original sim, I had put off until now.

    How do I upgrade while preserving baseband on Windows? I do not see any indication that any of these methods will hacktivate the iphone, so do not want any shocks done by assumptions.
     
  12. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #12
    The only way to do it is by downloading a custom ipsw for your device that has been made by an iPhone user using PwnageTool.

    If you don't want to go through with the downloading a custom ipsw route, you can update to 4.0/4.0.1/4.0.2 and still be able to unlock. But you will need to edit your host files or using TinyUmbrella to upgrade. And there is no hactivating 4.0-4.0.1 (you'll need the original sim). www.jailbreakme.com (straight from safari on iPhone) will jailbreak after being activated.

    4.0.2 can be jailbroken with LimeRa1n (which hactivates).

    If you desire to go to 4.1/4.2.1 you need a custom ipsw.
     
  13. dejeezu macrumors newbie

    Joined:
    Dec 11, 2010
    #13

    If I obtained a custom ipsw for 4.2.1 and proceed to shift-restore to it, is that the only step? (After which I just reinstall ultrasn0w from cydia)
     

Share This Page