Downgrading jailbroken 3G Iphone from OS 4.01 to 3.1.3 or 3.1.2 without saved SHSH ?

Discussion in 'Jailbreaks and iOS Hacks' started by Paavou, Aug 31, 2010.

  1. Paavou macrumors newbie

    Aug 31, 2010
    Hi guys.

    I have Iphone 3G with OS 4.0.1 installed ,jailbreak-ed and unlocked and SHSH saved in Cydia. But because OS 4.0 have slowed down my phone really badly I was wondering if there is a way to downgrade it back to OS 3.1.3 or 3.1.2.
    As I understand the main problem is that I don't have SHSH saved for 3.1.3 or 3.1.2 anywhere. Is there any workaround of this issue or isn't it possible at all and am I stucked with OS 4 forever?
  2. -aggie- macrumors P6


    Jun 19, 2009
    Where bunnies are welcome.
    You have a 3G, so it's much easier. Put your phone in DFU mode (see my sig) and then option (or shift) restore to the 3.1.3 or 3.1.2 .ipsw file you downloaded (google for download if you don't have it). Eventually, you'll get an error, so use recboot or tiny umbrella to get out of it. See here for more info:
  3. Paavou thread starter macrumors newbie

    Aug 31, 2010
    Thank you for replay.

    Just to be sure.
    Can I still jailbreak and unlock it after that?
  4. f4780y macrumors 6502


    Jul 21, 2009
    Troon, Scotland
    Yes, you can JB and unlock after you complete the downgrade.

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