Can I restore iPhone 4 to firmware of my choice?

Discussion in 'Jailbreaks and iOS Hacks' started by NJRonbo, May 25, 2011.

  1. NJRonbo macrumors 68000

    Joined:
    Jan 10, 2007
    #1
    I have a jailbroken iPhone 4 on firmware 4.2.1

    It's acting whacky today after a Cydia update.
    Cannot find the cause despite installing and uninstalling
    Cydia apps.

    Looks like I may have to reset the iPhone and rejailbreak.

    Thing is, I don't want to upgrade from 4.2.1

    Big reason is, tethering. AT&T seems to have tougher
    time snooping around with people who have 4.2.1

    Whether that is true or not....

    Can I simply download a 4.2.1 IPSW file and in iTunes
    have it update that firmware rather than the newest one?

    If that can be done, can someone take a moment and
    post step-by-step instructions to doing it including the
    specific right-click iTunes command to manually update
    the phone?

    Again, I want to reset iPhone and have it install iOS 4.2.1

    Hopefully it can be done. Then I can rejailbreak with GreenPoison.
     
  2. Cinemagic macrumors 6502

    Joined:
    Sep 26, 2007
    #2
    No you can't - unless you have your SHSH saved for the particular firmware. If you don't understand this, just look through the threads or search for SHSH and you'll see why.
     
  3. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #3
    You cant.
    Open cydia and look at the top of the page what shsh blobs you have on file.
    You can only restore to firmware versions listed up there.
     
  4. svenn macrumors 6502

    Joined:
    Aug 11, 2010
    #4
    If he is jb on 4.2.1, isn't it safe to assume cydia has saved shsh for 4.2.1? Or did I just assume and make an a...
     
  5. eastercat macrumors 68040

    eastercat

    Joined:
    Mar 3, 2008
    Location:
    PDX
    #5
    It's likely, but considering the OP's seeming inability to use google or the search function, there's a possibility the blob wasn't saved.

     
  6. NJRonbo thread starter macrumors 68000

    Joined:
    Jan 10, 2007
    #6
    Love the way some people just go after others
    trying to learn this stuff.

    Sorry. It's easier for me to ask.

    I do have iOS 4.2.1 listed at the top of Cydia.

    I will do a search and try to come up with the
    answer on my own, but in the meantime, if
    someone would be kind enough to explain how
    I can restore my iPhone to 4.2.1 I would be very,
    very appreciative.
     
  7. NJRonbo thread starter macrumors 68000

    Joined:
    Jan 10, 2007

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