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Thread: **HOW TO jailbreak 3[GS] on 4.0 official using ANY FIRMWARE

is a discussion within the

3G[S] Downgrading

forums, a part of the

Jailbreak / Downgrading / Upgrading

section;
No matter what Firmware you are on, even 4.0 official, just go to the MMI downloads section and get 3.1.2 Firmware ModMyi Forums - Downloads - iPhone 3GS 3.1.2 Blackra1n
...
  1. #1
    Retired Moderator one1's Avatar
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    Default **HOW TO jailbreak 3[GS] on 4.0 official using ANY FIRMWARE
    No matter what Firmware you are on, even 4.0 official, just go to the MMI downloads section and get

    3.1.2 Firmware ModMyi Forums - Downloads - iPhone 3GS 3.1.2

    Blackra1n RC3 ModMyi Forums - Downloads - blackra1n RC3

    Point your hosts file to the Cydia Server where your 3.1.2 SHSH blobs are stored.

    Restore to 3.1.2 EVEN IF you are on 4.0 official.

    Run Blackra1n to jailbreak 3.1.2.

    Now you are jailbroken again, simply upgrade to a Pwned 4.0 FW.


    I JUST DID IT, it works PERFECTLY. I was on unpwned 4.0 official from where I upgraded last night
    Screw #Winning, I'm #Juanning
    iMac 27" i5 quad 2.8Ghz (1TB), MacBook Pro 17" 2.6, iPhone 4s

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  3. #2
    Livin the iPhone Life bobright's Avatar
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    would this work for someone on windows?

    im on the latest 4.0 with my 3gs and am trying to JB and Unlock, not sure where to start though


  4. #3
    Green Apple dsanchez's Avatar
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    Do u have your shsh stored?

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  6. #4
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    Dont know about anyone else but my 3GS wont restore to 3.1.2, even though i have SHSH blobs saved for it, and have directed my host file to saurik's servers.

    The only firmwares that seem to install for me are unpwned 3.0 (gives a 1015 error but works), and unpwned 3.1.3 (same)

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  8. #5
    Retired Moderator one1's Avatar
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    THE ONLY thing you have to have to do this that you can't just "go get" is SHSH blobs on Cydia, if you have them there is NOTHING that will stop a 4.0 pwned jailbreak/unlock using this method.
    Screw #Winning, I'm #Juanning
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  10. #6
    Green Apple dsanchez's Avatar
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    I think if u jb 3.0 u should b able to upgrade to jbn 4.0. I could b wrong tho

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  12. #7
    iPhone? More like MyPhone
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    Point your hosts file to the Cydia Server where your 3.1.2 SHSH blobs are stored.

    Restore to 3.1.2 EVEN IF you are on 4.0 official.




    How do I do this? God I feel like a noob again.

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  14. #8
    Retired Moderator one1's Avatar
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    http://www.saurik.com/id/12


    Bypassing the Overlord

    To this end, I have constructed a server that duplicates the functionality exposed by Apple's signature server, except using "on file" results rather than live requests.
    All we need, then, is to make iTunes use it. Luckily, most operating systems also have the ability to locally define bypasses on specific hostnames through a file called hosts. Using this, we can redirect requests to Apple's signature server to Cydia.
    So, open the file CWindows\System32\drivers\etc\hosts (Windows) or /etc/hosts (Mac OS X) and add the following entry to the bottom of the file.
    74.208.10.249 gs.apple.com
    Now, when iTunes thinks it is talking to Apple, it is talking to Cydia instead. Doing this will allow iTunes to access signatures already stored by Cydia's "on file" feature.
    This server will also act as a cache for any SHSH blobs it hasn't seen, acting as an intermediary to Apple's server. This effectively registers your device with the "on file" mechanism, which means you can now enjoy the protections of being able to downgrade your firmware in the future even if you aren't jailbroken.
    Screw #Winning, I'm #Juanning
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  16. #9
    Green Apple
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    which itunes version do you need? or does that not matter?

  17. #10
    Retired Moderator one1's Avatar
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    Does not matter I did it on the latest itunes that was just released. This flat out works no matter what. All you need is blobs and it will work.
    Screw #Winning, I'm #Juanning
    iMac 27" i5 quad 2.8Ghz (1TB), MacBook Pro 17" 2.6, iPhone 4s

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  19. #11
    iPhone? More like MyPhone dazzer1983's Avatar
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    Exactly what im doing now. Glad to see it worked for you. But im using windows vista with a custom ipsw made on mac. hope it works. cross fingers : )

  20. #12
    Retired Moderator one1's Avatar
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    It'll work
    Screw #Winning, I'm #Juanning
    iMac 27" i5 quad 2.8Ghz (1TB), MacBook Pro 17" 2.6, iPhone 4s

  21. #13
    iPhone? More like MyPhone
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    I hit Shift and restore to pick out the 3.1.2 ipsw, correct? It's been forever since I have done any of this.

  22. #14
    Livin the iPhone Life Poseidon79's Avatar
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    It should be noted that this is only for old bootrom devices.

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  24. #15
    CHG128 和平與愛 chg128's Avatar
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    how to Point your hosts file to the Cydia Server? i m new about this thing...

  25. #16
    Green Apple dsanchez's Avatar
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    ^^^ check saurik'd website all the instructions are there


  26. #17
    Retired Moderator one1's Avatar
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    Quote Originally Posted by chg128 View Post
    how to Point your hosts file to the Cydia Server? i m new about this thing...
    Did you not see post 7 ask this and post 8 answer it? It's right in this very thread.
    Screw #Winning, I'm #Juanning
    iMac 27" i5 quad 2.8Ghz (1TB), MacBook Pro 17" 2.6, iPhone 4s

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  28. #18
    Green Apple dsanchez's Avatar
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    ^ ha!

    I've got to say you're one of the few here that "knows" that don't really get annoyed by the noobs. Some people here act like everyone should know. But some people should just search b4 they post lol
    Last edited by dsanchez; 06-22-2010 at 06:05 PM. Reason: Automerged Doublepost

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  30. #19
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    Still having big problems, even following this method.

    I can get it to restore to 3.1.2, but it gives me a 1015 error at the end.

    iReb doesnt resolve the issue, and BlackRain just hangs during the installation.

    Unsure how to proceed from here.

  31. #20
    Green Apple dsanchez's Avatar
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    Ireb should fix it for u. Make sure that u installed "libusb" or ire won't work

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