How to downgrade to IOS 8 using IOS9 backup

Discussion in 'iOS 9' started by conepwnd, Jul 27, 2015.

  1. conepwnd, Jul 27, 2015
    Last edited: Jul 27, 2015

    conepwnd macrumors newbie

    Joined:
    Jul 27, 2015
    #1
    So I recently updated my phone to IOS 9, everything was pretty good until my action camera app couldn't work with my phone because of IOS 9. I know this because I tried it on my friends Iphone and it worked fine.

    Now I would like to downgrade my phone back to IOS 8, I know you click Restore iPhone then use a backup but the problem is it won't be able to use the IOS 9 backup.

    Is there anyway to downgrade my phone to an IOS 8 version using a IOS 9 backup of the phone?

    Thanks, Enoc

    http://i.imgur.com/B9E2pun.png
     

    Attached Files:

  2. lagwagon Suspended

    lagwagon

    Joined:
    Oct 12, 2014
    Location:
    Calgary, Alberta, Canada
    #2
    I do not think backups are allowed cross version. At least not from a higher version of iOS to a lower (9 to 8, 8 to 7, 7 to 6...and so on.)
     
  3. daijholt macrumors 6502a

    daijholt

    Joined:
    Jun 14, 2013
    Location:
    Wales, UK
    #3
    One of my colleagues mentioned this to me earlier this month, but I suggest you make a copy of the entire backup folder before doing this, as I've been meaning to verify if this actually works but just haven't yet had the time.

    On Windows, go to %appdata%\Roaming\Apple Computer\MobileSync\Backup\ or to wherever your iOS 9 backup is stored in OS X.

    If you have multiple folders in this directory, You can find which is your iOS 9 backup by checking the time and date of each folder's creation against the time and date shown for this backup in iTunes.

    Find and Edit the Info.plist file with a text editor.

    Look for this inside the file:
    <key>Product Version</key>
    <string>9.0</string>

    Change the iOS version from 9.0 to whatever version you're restoring to and save it. Then try restoring your backup to an iOS 8 device.

    Also, if you do give it a go before I do, let us know if it works!
     
  4. conepwnd thread starter macrumors newbie

    Joined:
    Jul 27, 2015
    #4
    Thanks for the reply, I am a little scared to try it but I have created a backup of the folder and it should be fine. I'll try it out tomorrow seeing that I need my phone for tomorrow.

    I'll be sure to get back to you
     
  5. Shirasaki macrumors 603

    Shirasaki

    Joined:
    May 16, 2015
    #5
    Before trying out this method, I would recommend you do a backup of your current iOS 9, downgrade, and make a backup of iOS 8 once completed.

    If I were you, I would try to manually merge them by copying app Data to new iOS 8 backup. Plus, if you simply change that version number to 8.4, for example, new settings and removed settings from iOS 8 to iOS 9 would cause problems.
     
  6. techspin macrumors 6502a

    Joined:
    Jul 21, 2014
    #6
    For the sake of tinkering, I attempted to move the PB1 messages file to an 8.4 backup. Received an error message before backup could begin.
     
  7. The Doctor11 macrumors 603

    The Doctor11

    Joined:
    Dec 15, 2013
    Location:
    New York
    #7
    This is interesting. Can't wait to see if someone can do it successfully.
     
  8. saudor macrumors 6502

    Joined:
    Jul 18, 2011
    #8
    It was possible in previous versions.. havent tried it with 9 to 8. One thing for sure is, you'll lose app data since sandbox is no longer accessible in 8.3+

    Messages may be another story
     
  9. zorinlynx macrumors 601

    zorinlynx

    Joined:
    May 31, 2007
    Location:
    Florida, USA
    #9
    I have hacked the version number in a backup to restore to an earlier OS version before.

    It broke things in subtle, very annoying ways. I had to revert to the last "real" backup I made using that version.

    It's not worth the risk of doing this; you might lose data or find yourself unable to use your device. Either revert to the last iOS 8 backup you made, or just sweat out the iOS 9 irritations until they are fixed.
     
  10. bushido Suspended

    bushido

    Joined:
    Mar 26, 2008
    Location:
    Germany
    #10
    i think the last time this method worked was ging from iOS 6 to 5
     
  11. v1597psh macrumors regular

    v1597psh

    Joined:
    Feb 4, 2014
    Location:
    London
    #11
    Done this with iOS 7 last summer. Messages haven't been restored
     

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