Downgrade 4.2 to 4.1 [IP4]

Discussion in 'Jailbreaks and iOS Hacks' started by hectic6, Dec 8, 2010.

  1. hectic6 macrumors member

    Joined:
    Jul 22, 2009
    #1
    hi,

    I'm using a iphone 4 jailbroken on 4.1 using limera1n RC4 and something went wrong and my iphone went on a respring loop at lockscreen.

    I had saved my SHSH on cydia but not on my computer (TU).

    As i had to quickly use my iphone for important reasons (business trip in 24 hours), i decided to upgrade to 4.2.1 and now i'm totally loss on how can i downgrade back to 4.1

    Can someone give me clear instructions on how to downgrade?

    My itunes is now 10.1 and iphone on 4.21 (8C148)

    Modem Firmware 03.10.01

    I don't need unlock as my phone is factory unlock.

    And is Limera1n still good or should i use greenposion to re-jailbreak?

    thanks~:)
     
  2. PsstGreek macrumors 68040

    PsstGreek

    Joined:
    Oct 21, 2010
    Location:
    Tampa Bay
    #2
  3. maturola macrumors 68040

    maturola

    Joined:
    Oct 29, 2007
    Location:
    Atlanta, GA
    #3
    You seen to have your SHSHs saved so it is not a problem.

    You got a couple of options you can use TU to point your host file to Cydia server (server will use your saved SHSHs to authenticate the firmware), and Option+restore using iTunes (restore to 4.1, google for the link to the firmware if you don't have it) after the restore you can use Limera1n or Greenposi0n (doesn;t really matter they both works and use same exploit)

    You can also use Pwnage tool if you got a Mac, cook a 4.1 custom firmware and them use iTunes to restore, this custom firmware will be already jailbroken.

    Good luck. :D
     

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