Downgrade iPhone 4 / iPad 2 From iOS 5 to iOS 4.3.3 Using TinyCFW


NotCom a.k.a semaphore – iOS hacker and developer of TinyUmbrella – a popular tool that allows you to take backups of SHSH blobs (ECID SHSH) so that you can downgrade to an older version of the iOS has released a new tool called TinyCFW for iPhone 4 and iPad 2 users.

TinyCFW allows iPhone 4 and iPad 2 users who have taken backup of iOS 4.3.3. SHSH blobs to downgrade from iOS 5.0 to iOS 4.3.3.

NotCom explains:

TinyCFW is a simple tool I put together for a friend of mine. He has an iPad2 GSM and has his 4.3.3 SHSH but since Apple is no longer signing 4.3.3, it isn’t possible to downgrade to 4.3.3 without getting stuck in a 1015 recovery loop.

Here’s what TinyCFW can do:

  • It will modify an existing ipsw for an ipad2 gsm/cdma or iphone4 gsm/cdma
  • It will create an ipsw that you can use with TinyUmbrella AND iTunes to restore to a version of iOS that you have SHSHs for.
  • It is primarily for iPad2 with a baseband OR iPhone 4.

NotCom has also clarified that TinyCFW is not:

  • A jailbreak
  • An unlock
  • A tool to protect your baseband.
  • A tool that will restore your device to any firmware
  • A tool for use with iPhone 3GS, iPhone 3G, iPad, or iPhone 4S

He has also provided the following instructions to use TinyCFW:

The usage is simple. Start the application. Once the window comes up, click the top button and choose an ipsw for which you have SHSHs for. The app will scan it and tell you the firmware and baseband versions in the ipsw you selected and the firmware and baseband versions that will be in the target ipsw when you click the second button. If you’re ready, click ‘Save Target IPSW’. This will take a minute or two and when it is finished, you will have a file named:

<your original ipsw name>.bbupdate.ipsw.

You can use this ipsw with iTunes and TinyUmbrella to restore your iPad2 GSM/CDMA back to say 4.3.3 (if you have 4.3.3 SHSH).

NotCom has mentioned that he plans to include this functionality in TinyPwn and expects it to be far more robust then this initial version. So please proceed with caution.

So if you have iOS 4.3.3 SHSH blobs for your iPhone 4 and iPad 2 and can’t wait any longer for the jailbreak, then you can download the tool from his website and give it shot. Please don’t forget to let us know how it goes.

[via NotCom’s blog]