Friend has iPhone 3G on 4.2. Can they revert back to 3.1.3?

Discussion in 'Jailbreaks and iOS Hacks' started by WiiDSmoker, Dec 27, 2010.

  1. WiiDSmoker macrumors 65816

    WiiDSmoker

    Joined:
    Sep 15, 2009
    Location:
    Hermitage, TN
    #1
    Friend has the iPhone 3G on 4.2.1. Incredibly slow and laggy compared to 3.1.3. Is it possible to downgrade their phone? They aren't hacked nor have ever been.
     
  2. Myzhi macrumors 6502a

    Joined:
    Dec 15, 2009
    #2
    Yes. On 3G, you can restore to 3.1.3 and below because Apple didn't start SHSH blobs for them until 4.0.
     
  3. WiiDSmoker thread starter macrumors 65816

    WiiDSmoker

    Joined:
    Sep 15, 2009
    Location:
    Hermitage, TN
    #3
    Just open iTunes. Put phone into DFU mode and then do shift+ in iTunes and choose the 3.1.3 ISPW?
     
  4. jpetticrew macrumors 6502a

    jpetticrew

    Joined:
    May 13, 2009
    Location:
    Texas
    #4
    You got it.
     
  5. celticpride678

    Joined:
    Feb 15, 2009
    Location:
    Boston, MA
    #5
    This makes no sense. Apple has been using SHSH blobs for quite some time.

    The reason people can downgrade to a lower OS on the iPhone 3G without the need of blobs stored is because the hardware that checks the OS version was not included in the iPhone 3G.
     
  6. WiiDSmoker thread starter macrumors 65816

    WiiDSmoker

    Joined:
    Sep 15, 2009
    Location:
    Hermitage, TN
  7. Myzhi macrumors 6502a

    Joined:
    Dec 15, 2009
    #7
    Apple started SHSH blobs on 3GS, but they didn't add the software SHSH checks to the 3G until 4.0. Why else do you think there are no SHSH blobs for 3G before than?
     
  8. labman macrumors 604

    labman

    Joined:
    Jun 9, 2009
    Location:
    Mich near Detroit
    #8
    ^1+ before the 3GS no SHSH blobs needed after the 3GS yes.
     
  9. ssdeg7 macrumors 6502a

    ssdeg7

    Joined:
    Jul 15, 2010

Share This Page