Downgrading iPhone 3G Firmware?

Discussion in 'Jailbreaks and iOS Hacks' started by shuffles, Mar 9, 2011.

  1. shuffles macrumors 6502

    shuffles

    Joined:
    Nov 7, 2007
    Location:
    dublin, ireland
    #1
    My g/f is giving me her old iPhone 3G later as she uses a 3GS. I'm looking to downgrade the firmware because the phone is running really slow. I don't know the name of the current firmware on the 3G but it's the one that added folders and the background picture on the home screen. I figure this is why the phone is running really slowly? If I can downgrade it to before, will I see a significant performance boost?

    Also, by doing this, will the phone be completely wiped? She said that all the music on the 3G is not on her current laptop and she doesn't want to lose it by me wiping the phone.

    If this is the solution, how do I go about downgrading it?
     
  2. shuffles thread starter macrumors 6502

    shuffles

    Joined:
    Nov 7, 2007
    Location:
    dublin, ireland
    #2
    I just realised that when I connect it to my mac her music will be lost. Is there a way I can save her music somewhere?
     
  3. awadeee macrumors 68020

    awadeee

    Joined:
    Jan 21, 2011
    Location:
    Viper City
    #3
    You can see your firmware by going Settings > General > About > Version.

    Yes, the newer firmware is most likely the cause of your performance issue because the 3G hardware is not current enough to run the higher firmwares. Hence why the 3G isn't supported on iOS 4.3.

    You probably won't be able to downgrade very far unless you have SHSH blobs saved for the older firmwares (from Cydia). If you have no idea what this means then you probably don't have them. You can always just put your phone in DFU mode, shift (or option, if on a Mac) + Restore and manually select a firmware to restore to (available at http://www.felixbruns.de/iPod/firmware/), and hope for the best but Apple probably won't sign the restore and it will fail.

    To avoid the music being lost upon sync you can go into iTunes and go Edit > Preferences > Devices tab and check "Prevent iPhones, iPods, and iPads from syncing automatically". But when you downgrade the firmware you're going to lose all the music anyway so you might want to look into a iPod to computer music extract program such as iDump. Not sure if it exists anymore but it worked for me back in the day.
     
  4. shuffles thread starter macrumors 6502

    shuffles

    Joined:
    Nov 7, 2007
    Location:
    dublin, ireland
    #4
  5. Crystal-RX macrumors 68030

    Crystal-RX

    Joined:
    Dec 22, 2008
    Location:
    Seattle, WA USA
    #6
    for 3G, you don't need SHS blobs to downgrade the firmware, Itunes will give a 1015 error message when downgrading, just use tiny umbrella to kick the phone out of recovery mode.
     
  6. kuebby macrumors 68000

    kuebby

    Joined:
    Jan 18, 2007
    Location:
    SFV
    #7
    Definitely use Senuti to transfer her music to your computer, it's the best software I'll come across for that issue.
     
  7. awadeee macrumors 68020

    awadeee

    Joined:
    Jan 21, 2011
    Location:
    Viper City
    #8
    Oh sweet. I've bought and sold a few 3Gs but that minor detail must have slipped my mind. Thanks for the heads up.
     
  8. gravytrain84 macrumors 6502a

    gravytrain84

    Joined:
    Jun 24, 2010
    Location:
    LA
    #9
    Really? Why?


    eta: OP, were you able to downgrade?
     

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