iPhone Downgrading 3GS to 4.1 without jailbreak

Discussion in 'Jailbreaks and iOS Hacks' started by guspasho, Jun 14, 2012.

  1. guspasho macrumors regular

    Joined:
    Apr 13, 2011
    #1
    I want to downgrade my 3GS to iOS 4.1 without jail breaking it. Apple is still signing 4.1 for the 3GS and I have blobs saved from Tiny Umbrella. The 3GS is currently on 5.0.1. I've been putting it in recovery mode, running TSS server from TU, and selecting the 4.1 ipsw using option+restore in iTunes, but every time I get a different error message.

    Is it even possible to downgrade a non-jailbroken device, with blobs? I cannot find any clear instructions on how to do it anywhere. Thanks!
     
  2. kalirob99 macrumors 68000

    kalirob99

    Joined:
    Dec 24, 2008
    Location:
    California
    #2
    I haven't tried myself, but I'd imagine it shouldn't be an issue. Though down grading to a lower major iOS would be a pain if not signed, but in this case it is. What are the errors your getting? You say they vary?
     
  3. BumpyFlatline macrumors 68030

    BumpyFlatline

    Joined:
    Apr 11, 2012
    #3
    If 4.1 is being signed, you should be able to just use iTunes. Don't use tss server and make sure your host files point to apple's servers, not Cydia servers. Download the official 4.1 firmware file. Once you've taken care of this checklist, plug your phone into the computer, enter DFU mode, open up iTunes and shift click restore. Then manually choose the 4.1 firmware file you just downloaded. If apple is signing it, it should restore no problem.

    What errors are you getting. Maybe you're having a USB cable/port issue too.
     
  4. ZCherub macrumors 6502a

    ZCherub

    Joined:
    Jul 7, 2010
    Location:
    GA, USA
    #4
    Was about to say exactly this. Just shift+restore - no TU needed if Apple is still sighing the firmware.

    Also, being jailbroken has nothing to do with restoring at all, so don't worry about whether you are or are not jailbroken. The process is identical anyway.
     
  5. guspasho thread starter macrumors regular

    Joined:
    Apr 13, 2011
    #5
    I'm getting errors 20, 1015, and 3014 most frequently. Sometimes a few others, 1016 among them I think.

    ----------

    I've done all this. Maybe I'm not using the official IPSW? Where can I find the official one.
     
  6. utahman130 macrumors 6502a

    utahman130

    Joined:
    Jun 7, 2012
    #6
    Official 4.1 3GS Restore
     
  7. Applejuiced macrumors Westmere

    Applejuiced

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    Apr 16, 2008
    Location:
    At the iPhone hacks section.
  8. kalirob99 macrumors 68000

    kalirob99

    Joined:
    Dec 24, 2008
    Location:
    California
    #8
    I was just thinking that.
    If not, I wonder if your using a custom host file (you edited/added entries). It can be testy over that when you restore. And no need to use TU, it's still signed. >_>b So you just need the ips and iTunes.
     
  9. guspasho thread starter macrumors regular

    Joined:
    Apr 13, 2011
    #9
    I don't know. I don't know what that means. I have attached a few iPads to this system, and restore them regularly through iTunes, an iPad 1 (GSM) and an iPad 2 (CDMA), neither have an active 3G plan though.

    ----------

    Thank you! My hosts file has been edited! I'm going to try a clean system and see if this gets easier. In the future I want to restore to no-longer-signed versions of iOS, such as 5.1.1 after 6 comes out, and I was trying to figure out that process as well. I still need to figure it out.
     
  10. ZCherub macrumors 6502a

    ZCherub

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    Jul 7, 2010
    Location:
    GA, USA
    #10
    Go to Settings > General > About, and tell us what the modem firmware section says.
     
  11. guspasho, Jun 15, 2012
    Last edited: Jun 15, 2012

    guspasho thread starter macrumors regular

    Joined:
    Apr 13, 2011
    #11
    So an update. I managed to downgrade it to 4.1, somehow. iTunes threw up an error message saying it didn't like it (I don't remember the specific message, I think something about not being eligible for an update?), and I wanted to repeat the feat anyway, so I updated to 5.1.1. Currently, with 5.1.1 (9B206), the modem firmware section says "05.16.05".

    And trying to downgrade on a clean MacBook Pro gets me error 20 every time. There is no third party software installed, iTunes and OSX are up-to-date (10.6.3 and 10.7.4 respectively), all updates applied.

    My steps are as follows:

    1) Connect the 3GS
    2) Option+Restore in iTunes, select the restore file that utahman130 linked to earlier in this topic
    3) Open, Restore, then iTunes produces the error "The iPhone "iPhone 3GS" couldn't be restored. An unknown error occurred (20)." and the phone is stuck in recovery mode with the Connect to iTunes image on the screen, the only way I know to recover from that is to restore using 5.1.1.

    EDIT: Re-reading the steps above, I noticed I didn't put the iPhone in DFU mode. After doing this I still get the error message "The iPhone "iPhone" could not be restored. An unknown error occurred (1015)."

    Steps are as follows:
    1) Connect the 3GS to iTunes
    2) Turn the phone off
    3) Press and hold power and home on the phone for 10 seconds, release power and hold home for another 10 seconds, to place phone in DFU mode
    4) Option+restore in iTunes, select the 4.1 restore
    5) iTunes produces the error 1015 and the phone is in (non-DFU) recovery mode.
     
  12. omgbeckyy macrumors newbie

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    Jun 18, 2012
  13. TriJetHero macrumors 601

    TriJetHero

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    Oct 13, 2010
    Location:
    World
    #13
    Error 1015
    This error is common when downgrading iPhones and 3G-enabled iPads. The problem occurs when the device's baseband has a higher version number than the baseband in the firmware you restored to. Just set auto-boot true in iRecovery or use iREB/TinyUmbrella/RecBoot.1 In case this is not working use Pwnage Tool to create a custom firmware WITHOUT the iPad baseband, put your device in pwned DFU mode and restore via iTunes.


    Just make a cudtom firmware, go into pwn-DFU and shif/alt restore in itunes
     
  14. omgbeckyy macrumors newbie

    Joined:
    Jun 18, 2012
    #14
    So you can GUARANTEE that they are signing it and i can just save shsh with tinyumbrella? I am able to return it in 7 days. I dont have the iPhone yet. I will soon. I just want to make sure
     
  15. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #15
    Yes, I GUARANTEE it with bumper to bumper coverage for 100K miles or 5 years whichever comes first.
     
  16. omgbeckyy macrumors newbie

    Joined:
    Jun 18, 2012
    #16
    Thanks!

    Ryan
     
  17. omgbeckyy macrumors newbie

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    Jun 18, 2012
  18. lucifieri macrumors newbie

    Joined:
    Aug 23, 2012
    #18
    Can someone confirm that iOS 4.1 is still being signed for the iPad 1 (WiFi ver.) ?

    Thanks
     
  19. guspasho thread starter macrumors regular

    Joined:
    Apr 13, 2011
    #19
    4.1 is not still being signed for the iPad 1, only for the 3G and 3GS last I checked.
     

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