Downgrading to ISO 4.0

Discussion in 'Jailbreaks and iOS Hacks' started by Eric Noa, Nov 30, 2010.

  1. Eric Noa macrumors 6502

    Eric Noa

    Joined:
    Nov 4, 2008
    #1
    I have a Jailbroken and unlock iPhone 4 running 4.1 and I want to downgrade so that I can activate FaceTime with MiTime, then I will upgrade to 4.1 again and jailbreak and unlock. What is the best method to downgrade to 4.0?
     
  2. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #2
    If you have the SHSH files saved for 4.0 then you can downgrade. Only way.
     
  3. Eric Noa thread starter macrumors 6502

    Eric Noa

    Joined:
    Nov 4, 2008
    #3
    I have them all...
     
  4. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #4
  5. Eric Noa thread starter macrumors 6502

    Eric Noa

    Joined:
    Nov 4, 2008
  6. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #6
    No problem:apple:
     
  7. Eric Noa thread starter macrumors 6502

    Eric Noa

    Joined:
    Nov 4, 2008
    #7
  8. Eric Noa thread starter macrumors 6502

    Eric Noa

    Joined:
    Nov 4, 2008
  9. labman macrumors 604

    labman

    Joined:
    Jun 9, 2009
    Location:
    Mich near Detroit
    #9
  10. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #10
    Error 21 is a hardware like said above. If you restore again it will work, just put your iPhone back into DFU mode. Eventually the error will come back again when you need to restore at another time.
     

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