Can I go back to iOS6 if I restore my iPhone?

Discussion in 'iOS 7' started by Jardins de Vin, Sep 22, 2013.

  1. macrumors 6502a

    Jardins de Vin

    Joined:
    Nov 6, 2012
    Location:
    Europe
    #1
    I’ve read about a technique where it was possible (I’m not sure through which methods), but only while the latest iOS6 versions were signed.

    Sadly, I’ve read that now they aren’t anymore. Guess I’ve been waiting too long, but hey, I wanted to test iOS7 after all.

    Now that I’ve realised that iOS7 is a complete disaster (which doesn’t even fit to the design of OSX Mavericks), I’ve decided I should go back. Plus, I still own an iPhone 4, and the phone is much slower now.

    Now my question is, if I simply restore my phone, from my latest backup, will it not reinstall iOS6 on it?
     
  2. moargolems, Sep 22, 2013
    Last edited: Sep 22, 2013

    macrumors regular

    Joined:
    Aug 21, 2011
    Location:
    Finland
    #2
    Nope. iTunes always restores your device to the newest possible firmware, unless you shift-click to an older firmware - however, you will not get past Apple's signature check. The last backup has nothing to do with the actual restoring process.

    The only instances, where you can shift-click to an earlier firmware, are when Apple is still signing it, or you have SHSH blobs saved on saurik's server (running Cydia for the first time and 'making your life easier') or on your computer (TinyUmbrella).
     
  3. macrumors newbie

    Joined:
    May 10, 2008
    #3
    Unfortunately no, Apple stopped signing older firmwares

    :(
     
  4. macrumors newbie

    Joined:
    Sep 22, 2013
    #4
  5. macrumors 603

    Tyler23

    Joined:
    Dec 2, 2010
    Location:
    Atlanta, GA
    #5
  6. macrumors newbie

    Joined:
    Sep 22, 2013
    #6
    Sorry!

    Sorry when I read it yesterday it was still working!
    I did succeed last year in taking an iPhone 3G back to iOS 3 after upgrades had slowed it down but I have forgotten how I did it. I was using a Mac desktop and I remember there was a website with many past iOS's to download and a small programme to install them. It is 2 am here in Hong Kong but I'll try to dig out the details tomorrow. I originally found out how to do it by 'Googling' the problem.
    John
     
  7. macrumors 603

    Tyler23

    Joined:
    Dec 2, 2010
    Location:
    Atlanta, GA
    #7
    You can do that on an iPhone 4 and earlier by having SHSH blobs saved for earlier versions of iOS.

    There is no way to downgrade an iPhone 4S or higher unless apple is signing the firmware, and they no longer are.

    Edit: just saw the OP has an iPhone 4, so it may be possible. Try googling.
     
  8. macrumors G3

    Joined:
    Jul 4, 2007
    Location:
    Atlanta, GA
    #8
    I remember part of the process was changing the URL iTunes checks against during activation so it didn't matter if Apple stopped signing the firmware.
     
  9. moargolems, Sep 22, 2013
    Last edited: Sep 22, 2013

    macrumors regular

    Joined:
    Aug 21, 2011
    Location:
    Finland
    #9
    You mean changing the hosts file? It doesn't matter as long as you have your SHSH saved on saurik's server (to where you are actually forwarding the hosts file). If not, it matters more than anything.

    There are four instances where the blobs are checked - one in the verifying, one in iBoot, one in the bootrom, and everytime you wake your phone from sleep, so the signatures must be valid at any times. Changing some URLs won't do the trick if you are missing the blobs.

    tl;dr: Restoring an iPhone 4 to earlier firmware requires you to have saved SHSH blobs. OP, have you jailbroken your device while on iOS 6?
     
  10. macrumors newbie

    Joined:
    Sep 22, 2013
    #10
  11. macrumors regular

    Joined:
    Aug 21, 2011
    Location:
    Finland
    #11

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