go back to 4.3.5 from 5.0

Discussion in 'iOS 5 and earlier' started by mattbeechey, Oct 20, 2011.

  1. mattbeechey macrumors newbie

    Joined:
    Oct 20, 2011
    #1
    help me please I need to downgrade my iphone back to 4.3.5 from 5.0 I cant fint the firmware and itunes doesnt seem to want to let me select diffrent firmwares does anyone have clue what i need to do?

    I need the downgrade because some of my music apps arnt working and need them for a gig tomorrow

    thanks for the help
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    You can only downgrade if you have your SHSH blobs for 4.3.5.
     
  3. mattbeechey thread starter macrumors newbie

    Joined:
    Oct 20, 2011
    #3
    i don't have shah blobs anything else i can do?
     
  4. wrinkster22 macrumors 68030

    wrinkster22

    Joined:
    Jun 11, 2011
    Location:
    Toronto
    #4
    nope. It is impossible to downgrade on non jailbroken IOS5 devices
     
  5. mattbeechey thread starter macrumors newbie

    Joined:
    Oct 20, 2011
  6. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #6
    If you don't have your blobs, you can never go back.
     
  7. Spectrum Abuser macrumors 65816

    Spectrum Abuser

    Joined:
    Aug 27, 2011
    #7
    This isn't a fairy-tale or cartoon. If you do not have SHSH blobs there is nothing you can do. Enjoy 5.0.

    ----------

    CORRECTION: You can downgrade on a non-jailbroken device. Tiny umbrella does not require you to be jailbroken in order to save your SHSH blobs. It's just the overall majority of users are jailbroken.
     
  8. mickey23 macrumors newbie

    Joined:
    Jan 16, 2010
    #8
    i dont know if what was said above is correct

    but ive down graded from ios 4 down to ios 3.1.3 on my old iphone 3g

    i just downloaded the OS then downloaded a program to pull my iphone out of recovery and bobs your uncle

    i dont know if that works the same on the 4 or 3gs though
     
  9. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #9
    The iPhone 4 can't run 3.1.3. The 3Gs still needs SHSH blobs. The iPhone 3G has soft SHSH blobs for 4.X firmwares and does not require them for 3.X or 2.X firmwares.
     
  10. madmaxmedia macrumors 68030

    Joined:
    Dec 17, 2003
    Location:
    Los Angeles, CA
    #10
    OP- are you the original owner of the phone, or did you buy it secondhand? If you bought it from someone else, maybe they saved SHSH blobs for a previous firmware (if you're really lucky.)

    It's worth a shot- download TinyUmbrella. Run it, and connect your phone via USB. It will tell you if any SHSH blobs are saved. Report back with results.

    Download it here-
    http://thefirmwareumbrella.blogspot.com/
     
  11. Nermal Moderator

    Nermal

    Staff Member

    Joined:
    Dec 7, 2002
    Location:
    New Zealand
    #11
    Has Apple really stopped signing 4.3.5? Wouldn't it have to continue signing so that you can do a restore on older devices (such as the 2nd-gen Touch)?

    NB: I'm new to all this; I'm on a first-gen device which doesn't require a signature. It's just a question :)
     
  12. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #12
    Apple still signs 4.2.1 for the iPhone 3G and iPod Touch 2G, but not for any other device. The signing window for 4.3.5 closed a few days ago, Monday I think.
     
  13. Nermal Moderator

    Nermal

    Staff Member

    Joined:
    Dec 7, 2002
    Location:
    New Zealand
    #13
    Ahh, I didn't realise that the older devices were on 4.2 or that signatures were model-dependent.

    It must be theoretically possible to get 4.3.5 back on there but I guess that it's in the "too hard basket" (and might involve very long-running brute force attacks).
     
  14. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #14
    The blobs are not only model dependent, but unique to each device. It is possible to remove the requirement for the SHSH blobs, but an untethered bootrom exploit is needed. So far this is only the 3Gs and older, but no one has done it yet. The SHSH blobs are encrypted with Apple's private key. The key is 128 or 256 bit, so brute forcing it would take a very long time.
     
  15. Nermal Moderator

    Nermal

    Staff Member

    Joined:
    Dec 7, 2002
    Location:
    New Zealand
    #15
    Yikes! Apple really seems to go to a lot of trouble to stop you from putting software on your own hardware >.<
     

Share This Page