It’s worth noting that since TinyCFW was never intended for public release, it is rougher than Clint Eastwood’s beard. Don’t expect it to work flawlessly, and moreover, don’t complain if it doesn’t complete the job. Sure, it will modify an existing IPSW for an iPad 2 or iPhone 4 to update your baseband to the latest, and it will also create an IPSW which you can use with TinyUmbrella and iTunes to restore to a version of iOS of which you have conserved SHSH blobs. But, it’s not a jailbreak, nor an unlock, and will not protect your baseband, nor does it work with any device aside from the aforementioned.

Note:

TinyCFW only supports GSM version of iPad 2 and iPhone 4. All other iOS devices are not supported.
Requires Java
iOS 4.3.3 for iPhone 4 or iPad 2.
You’ll need 2.5GB of RAM, so your netbook probably won’t suffice this time around.

Step 1: Start the application by either double-clicking the .jar (for Mac) or running the .exe (for Windows), either of which can be found here.

 

Step 2: You’ll then be met with the application window. Click the top button and locate an IPSW you have saved SHSH blobs of.

Step 3: The app will then reveal the details of selected .IPSW such as firmware version and baseband, and also the baseband versions in the target .IPSW when you click the second button.

Step 4: Next, click ‘Save Target IPSW’ and let TinyCFW work its magic. Once the process is complete, you’ll be left with a file named <your original ipsw name>.bbupdate.ipsw.

That’s it! You can now, via iTunes, (with TinyUmbrella playing the supporting role it does so well) restore your iPad 2 or iPhone 4 back to 4.3.3 (or other iOS 4 iterations), so long as you’ve saved the blobs in the past. Make sure your device is in DFU mode once you are performing the restore, otherwise it won’t work.

Once you have successfully downgraded back to iOS 4.3.3, follow on how to jailbreak on iOS 4.3.3 untethered using JailbreakMe.

Update:

Firmware 4.3.3 ready for iPad2 bbupdate.ipsw. here

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