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Downgrade iOS 4.0.2 to iOS 4.0.1 on iPhone 4 & iPhone 3GS Without SHSH Blobs Saved!

Previously we shared a method which allowed you to downgrade your iPhone and iPod Touch firmware from iOS 4.0.2 to iOS 4.0.1, however the procedure for downgrading was valid only for those devices who have already saved the SHSH blobs of iOS 4.0.1. Folks at PwnMyI Forums have managed to downgrade iOS 4.0.2 to iOS 4.0.1 on iPhone 4 and iPhone 3GS (New bootrom) even if you haven't saved the SHSH blobs of iOS 4.0.1.

Steps to Downgrade from iOS 4.0.2 to iOS 4.0.1 Without SHSH Blobs:

  1. Download iOS 4.0.1 official IPSW file from here
  2. Rename the iOS 4.0.1 file from .IPSW to .ZIP or .RAR and extract it on your desktop using WinZip or WinRAR.
  3. Rename iOS 4.0.1 IPSW
    Extract iOS 4.0.1 IPSW

  4. Open buildmanifest.plist with Notepad on Windows (Use TextWrangler on Mac)
  5. Do search and replace all for 8A306 with 8A400 and save the file.
  6. Buildmanifest Plist

  7. Do the same with restore.plist
  8. Restore Plist

  9. Download iOS 4.0.2 official IPSW from here and change its extension to .ZIP or .RAR. Once changed, open it with WinRAR or WinZip (DO NOT EXTRACT IT, JUST OPEN IT BY WinRAR)
  10. Rename iOS 4.0.2 IPSW
    WinRAR iOS 4.0.2

  11. Now drag all the files you extracted in step 2 to the iOS 4.0.2 archive you just opened in the previous step.
  12. WinRAR iOS 4.0.2 Update

  13. Now delete all the DMG files that have 002 at the end, leaving only the 001 files left and save the iOS 4.0.2 archive.
  14. WinRAR iOS 4.0.2 002 Deleted

  15. Chance its extension back from .ZIP or .RAR to .IPSW.
  16. Rename Back iOS 4.0.2 IPSW

  17. Add the line to the host file.
  18. Windows HOSTS File

  19. Connect your iPhone in DFU mode. To do that just hold "Power" and the "Home" button for exactly 10 seconds and then release "Power" button but keep holding "Home" until iTunes detect your iPhone in Recovery Mode.
  20. On the summary page, hold down the SHIFT key on keyboard and press Restore button. You will be asked to choose the firmware file you want to restore, choose the modified iOS 4.0.2 IPSW file. If you are a Mac OS X user, use the ALT+Restore combo to choose the firmware file.
  21. Restore iPhone or iPod Touch Through iTunes

  22. Now you can jailbreak iOS 4.0.1 with JailbreakMe and unlock it with Ultrasn0w.

[via PwnMyI Forums]

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Leave a message...

    iPhoneDude11 years, 1 month ago

    Are you sure this is accurate and safe on iPhone 3GS 4.0.2? Im Abit scared to follow lolx

    muh11 years, 1 month ago

    does not work for me… :(

    iPhone 4 32 GB

      Wolverine11 years, 1 month ago

      Yup! The procedure is invalid! Please don’t try it anymore!

    AJ11 years, 1 month ago

    Is this process going to work with new iPhone 4 IOS 4.0.2?