Monday, December 12, 2011

How to Downgrade to iOS 5.0 Without SHSH Blobs

Yes, you read right. It’s possible to downgrade your iPhone from iOS 5.0.1
to iOS 5.0 even if you don’t have your SHSH blobs saved.
With that said, there are some things you’ll want to note before trying this, and it doesn’t work for the iPhone 4S.
Since iOS 5.0.1 has been confirmed to be susceptible to Chronic Dev Team’s untethered jailbreak, I’m not sure if anyone even cares about downgrading at this point, but nonetheless, it’s still pretty cool that you can do this without your SHSH blobs.

How to Downgrade to iOS 5 Without SHSH Blobs

Notes:
  • This doesn’t work for the iPhone 4S.
  • This was performed on a Windows machine.
  • This requires a tethered boot.
  • You can’t go back and save your SHSH blobs.
Things’s You’ll Need:
  • Sn0wbreeze
  • RedSn0w (for tethered boot) although you may be successful with iBooty.
  • iOS 5 and iOS 5.0.1 firmware files.
  • 7-Zip
You can download all of the above from our downloads page except for 7-Zip, which you can get for free here.
Step 1: Create custom firmwares for iOS 5 and iOS 5.0.1 using Sn0wbreeze.
Step 2: Open iOS 5.0.1 archive using 7-Zip and notate the size and name of the two .dmg files in notepad.
Step 3: Delete the two .dmg files from the iOS 5.0.1 archive.
Step 4: Open iOS 5.0 archive using 7-Zip and extract the two .dmg files.
Step 5: Rename the extracted .dmg files based on the names you notate from the files in step 2. Make sure they are named according to size. See video for more details.
Step 6: Re-open iOS 5.0.1 archive using 7-Zip and copy the two renamed .dmg files into the archive and exit.
Step 7: Place your iDevice into DFU mode, open Sn0wbreeze and run iReb to put the device into PwnedDFU mode for custom restore in iTunes.
Step 8: Open iTunes, and restore using your custom 5.0.1 Sn0wBreeze firmware that you added the renamed .dmg’s to.
Step 9: Boot tethered with RedSn0w. You will need to go to Extras > Select IPSW and point to the original iOS 5.0 firmware then select Just Boot.
Step 10: Once device reboots check General > About and your device should be downgraded to iOS 5.0.
Extra special thanks goes out to unkn0un for tipping us off about this.
What do you think? True, it’s not nearly as compelling as it may have been if theupcoming untethered jailbreak was iOS 5.0 only, but it’s still pretty neat, don’t you think?

13 comments:

  1. Man U R the best
    this was a good piece of info to know. Awesome instructions.

    Thank Man

    ReplyDelete
  2. Can i do this on a mac? and how?

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  3. will it work to downgrade from iOS 5.0.1 to iOS 4.3.3 ??
    thank you very much in advance

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  4. works 100%... tested on iphone 3gs bb 6.15.00.

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  5. I found 3 .dmg files in IOS 5.0.1 what should I do please

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  6. I found 3 .dmg files in ios 5.0.1 which 2 should I delete please?

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  7. i'm with "wessam because i found three .dmg in ios 5.0.1

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  8. hey i cant update using the modified ios

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  9. i cant update using modified one..it pop up with (11) error.
    Does this downgrade the baseband as well??Coz the ios is still using the 4.11.08 fw file in it.

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  10. Will this downgrade baseband also from 04.11.08 to 04.10.1

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  11. does it work with downgrade to ios 5.0.1 or 5.0 from 5.1?

    I followed the steps but using 5.1 and 5.0.1.
    It was going all well until the step where it turns reboots to the apple logo with the spinning wheel below it and froze there but the wheel still continued to rotate till itunes threw error (21).
    What should i do??

    ReplyDelete
    Replies
    1. Damn, this is what I wanted to do too..but now I'm hesitant. Did you manage to fix it?

      Delete