Restore iOS 5 back to 4?

Discussion in 'Jailbreaks and iOS Hacks' started by prmccarron, Jun 15, 2011.

  1. prmccarron macrumors regular

    prmccarron

    Joined:
    Nov 7, 2009
    #1
    Hi
    I recently updated my iPhone 4 (CDMA) to iOS 5 developer preview. Realizing I depend on a jailbreak, and none of the apps I use are iOS 5 ready, I wanted to downgrade back to iOS 4. However, being used to an iPod touch, I never (until now) thought about one major problem in the iPhone: baseband. Is there anyway I can get back to iOS 4(.2.6) now? I really hate this at the moment :/
    Thanks
     
  2. nebo1ss macrumors 68030

    Joined:
    Jun 2, 2010
    #2
    I have no experience of the CDMA phone but on the GSM it has always been possible to go back to the production version still being signed by apple from the test version. This is possible only the IP4 because apple signs both firmware and baseband.

    I have not heard that any thing is different this time. This is normally possible only from beta software to current production.
     
  3. rick snagwell macrumors 68040

    rick snagwell

    Joined:
    Feb 12, 2011
    Location:
    oceanside, ca
    #3
    you cannot go back to 4.2.6 unless your shsh blobs are stored in cydia. then you can use TU.

    4.2.8 is good to restore too though, thats what i did.
     
  4. Ponchobot macrumors member

    Joined:
    Apr 11, 2011
    #5
    Put it in p0wned DFU and then restore to a stock firmware.
     
  5. rick snagwell macrumors 68040

    rick snagwell

    Joined:
    Feb 12, 2011
    Location:
    oceanside, ca
  6. Phil A. Moderator

    Phil A.

    Staff Member

    Joined:
    Apr 2, 2006
    Location:
    Shropshire, UK
    #7
  7. ert3 macrumors 6502a

    ert3

    Joined:
    Dec 10, 2007
    #8
    i get that you can DFU restore without changing your itunes version but i dont get how the phone being CDMA would change the iTunes restore process
     
  8. kuwxman macrumors 6502

    kuwxman

    Joined:
    Jul 25, 2009
    Location:
    Olathe, KS
    #9
    He was referring to the software version you posted. The CDMA iPhone isn't running 4.3.3, only the GSM.
     
  9. sal74 macrumors member

    Joined:
    Feb 26, 2009
    Location:
    Ontario, Canada
    #10
    iOS 5 beta 1 to 4.3.3

    I can confirm that the baseband also reverts back to 4.10.01 when downgrading from iOS 5 beta 1 to 4.3.3

    What I did to get back to 4.3.3:

    1. Put iPhone into DFU
    2. Hold "option" (on a Mac, hold "shift" on PC) and select 4.3.3 firmware
    3. 10 minutes later and you're laughing

    Thanks,

    Sal
     
  10. dlewis39 macrumors newbie

    Joined:
    Jul 6, 2011
    #11
    Restore iOS 5 back to 4?

    I still don't think the question about the CDMA version which is 4.2.8 has been answered. I am a registered developer but Apple's servers have been down since Monday which I was unaware of until I tried to update to 5b2on the Verizon unit I purchased last night. I get the Message...
    • "We're unable to complete your activation. This device is not registered as part of the iPhone Developer Program. If you are a member of the Program, please register your device in the iPhone Developer Program Portal"
    Even though it is registered. I would have no issue waiting except for the fact that I can't use it with iOS5 and it won't allow me to revert back to 4.2.8 no matter what I've done so far. So does anyone know how to get either os to work? Do I need to downgrade my baseband?
     
  11. Epic Orange, Jul 6, 2011
    Last edited: Jul 6, 2011

    Epic Orange macrumors member

    Epic Orange

    Joined:
    Jun 7, 2011
    Location:
    Element X
    #12
    http://mac.downloadatoz.com/tutoria...ade-ios-5-to-ios-4-2-8-for-iphone-4-cdma.html: It is possible, but you MUST require your SHSH blobs in order to downgrade. Unfortunately, for people on iOS 5 beta, you are going to have to wait until iOS 5 fully releases.

    However, you could try attempting to restore to a custom firmware of iOS 4.2.8 via Snowbreeze. [As well, make sure you do remove the iTunes 10.5 beta first, then get the latest iTunes from Apple's website: http://www.apple.com/itunes/download/]

    The following is a tutorial:
    http://www.redmondpie.com/jailbreak...d-and-ios-4.3.3-with-sn0wbreeze-2.7-tutorial/

    Hopefully a custom firmware could get through Apple's server. If custom firmware does not go through with iTunes 10.3.1, then try iReb v4.0x-4.1RC2: http://filetrip.net/f24152-iREB-v4-0-x-4-1RC2.html

    After running iReb, then attempt to restore to custom firmware. In this case, chances are 50% [estimated opinion].
     
  12. labman macrumors 604

    labman

    Joined:
    Jun 9, 2009
    Location:
    Mich near Detroit
  13. Epic Orange macrumors member

    Epic Orange

    Joined:
    Jun 7, 2011
    Location:
    Element X
    #14
    Thanks... :D I do not know if your mocking me or thanking me, but it sounds like you are... LOL ;)
     

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