These are instructions on how to downgrade your iPhone firmware using TinyUmbrella. In order to follow this tutorial you must already have saved your SHSH Blobs for the firmware you want to restore to.

You can use this tutorial to downgrade to iOS 4.3.3 in order to jailbreak using JailbreakMe. The Mac version of this tutorial is here.

Step One
Download TinyUmbrella from here and save it in a Pwnage folder on your desktop if dont have it already.


Step Two
Download the firmware you want to restore to from here and save it in a Pwnage folder on your desktop. Remember you must have saved your SHSH Blobs for this firmware already.


Step Three
Launch TinyUmbrella by double clicking its icon.


Step Four
Connect your device and make sure it lists saved SHSH Blobs for the firmware you are restoring to. You may need to click Save SHSH to restore your blobs from Cydia if you dont see any listed.


Step Five
Click the Start TSS Server button.



*Do not continue if TinyUmbrellas TSS server is not started successfully.

Step Six
Launch iTunes by clicking its icon in your Start Menu.


Step Seven
Place your iPhone into DFU mode by holding down the Power and Home buttons for 10 seconds then release the Power button and continue holding the Home button for another 10 seconds.

You can find help with DFU mode here.


Step Seven
Select your iPhone from the list of devices on the left, hold down the Shift key and click Restore.


Step Eight
Navigate to the Pwnage folder on your desktop, select the ipsw file you downloaded and click the Open button.


Step Nine
iTunes will now restore to the lower firmware version.


Step Ten
If you happen to get an Error 1 or you get stuck in recovery mode, you will need to use FixRecovery to get your device out of recovery mode.


Download FixRecovery from here and save it to the Pwnage folder on your desktop. Then extract the archive.


Download zlib1.dll from here and save it to the Pwnage folder on your desktop. Then extract the archive.


Step Eleven
Place your iPhone into DFU mode by holding down the Power and Home buttons for 10 seconds then release the Power button and continue holding the Home button for another 10 seconds.

You can find help with DFU mode here.


Step Twelve
Double click to launch the fixrecovery43 executable we just extracted.


Step Thirteen
FixRecovery will perform its magic after which your device will be successfully rebooted.





IMPORTANT:
● If fixrecovery does not work the first time you may need to rerestore to your desired firmware version and try again. Remember to keep the TSS Server running during your second restore as well.

● This tutorial does work to get your from iOS 5 beta back down to iOS 4. Although some have reported less issues with a lower version of iTunes this tutorial was tested to work with iTunes 10.5.0.77.

Users having a downgraded iPhone 3 / 3GS from 06.15.00 to 05.13.04 or lower baseband have the ability to unlock their gadgets with latest Ultrasn0w and capability to use their GPS functionality.

The very first is improved baseband 06.15.00 downgrading solution, and really should now include most iPhone 3G / iPhone 3GS devices. Keep in mind that any person having an iPhone 3GS that has been produced right after early 2011 — need to stay away from the 06.15.00 baseband. Additionally, thererrrs an easier method for the baseband downgrade.




The Revised Downgrading Steps are:

1. Connect your iPhone in normal mode, then click “Jailbreak” after redsn0w identifies its model and BB version (you needn’t pre-select the IPSW anymore).
2. Choose the “Downgrade from iPad baseband” option (you needn’t worry about de-selecting Cydia anymore).
3. Do a controlled “slide to power off” shutdown of your phone and proceed through the normal DFU ramdisk steps.

All one has to do to get this feature is to launch Redsn0w and go to Extras –> Even More -> DFU IPSW.

Today Apple has released iOS 4.3.5 for iPhone, iPod touch, iPad and Apple TV 2G to fix security vulnerability with certificate validation issue. Now, if you have saved SHSH blobs for iOS 4.3.4, 4.3.3, 4.3.2 or 4.3.1, you will be able to downgrade from iOS 4.3.4 to anyone of them.

Note: iPad 2 (3G models) are not supported on this tutorial as its baseband cant be downgraded so far.

Step 1: Download the required IPSW file to which you want to downgrade to, the links are given below for your convenience:

• iOS 4.3.4
• iOS 4.3.3
• iOS 4.3.2
• iOS 4.3.1

Step 2: Once you’ve downloaded the required IPSW file, its time you put your iPhone, iPad or iPod touch into DFU mode. The steps are as follows:

• Connect your iPhone, iPad or iPod touch to your PC or Mac.
• Turn your device off.
• Now launch iTunes.
• Hold down the Power button and the Home button simultaneously for 10 seconds.
• After 10 seconds, release the Power button but don’t let go of the Home button, your computer should detect a new USB device.
• At this point, iTunes will also recognize your device, whether its an iPhone, iPad or iPod touch.

At this point, your device’s screen should be off, if that’s so, then you’ve successfully put your device in DFU mode. If iTunes logo shows up, you’re in Recovery Mode, NOT DFU mode.

Step 3: Here comes the tricky and the most important part, you’re going to fool iTunes into thinking that its in contact with Apple’s servers, whereas we’re going to change that to Saurik’s server. In order to do this, follow the steps given below:

Windows users:

Navigate to C:WindowsSystem32driversetc and locate the file named as “hosts”.

Mac users:

Mac users can access the “hosts” file by navigating to “/etc/” folder, which can be found through Go > Go to Folder from within Finder.

If you’re on Windows, then open the “hosts” file in Notepad. If on a Mac, then open the “hosts” file in TextEdit, and add the following line at the end:

74.208.105.171 gs.apple.com

Refer to the screenshot below if you’re having confusion:

Just save the file and close Notepad or TextEdit, and you’re all set for the downgrade.

A quick note for Windows 7 and Vista users: Start Notepad with “Administrator privileges”, that can be done by right-clicking the Notepad app, and there you will see the “Administrator privileges” option, simply click and launch.

A quick note for Mac OS X users: While saving the host file on your Mac, you should have complete read and write privileges in order to make changes. Getting a permission error? A simple workaround is to copy the host file to your Mac’s desktop, from there make the changes in TextEdit, save the file, and copy it back to the original location, and replace the original host file with the one which you just created.

Step 4: Launch iTunes, choose your device from the left sidebar. Hold down the left “Shift” key if you’re on Windows or hold down the left “alt” key if you’re on a Mac and click on “Restore”, do not click anything else! A new window will pop up asking you for the location of the IPSW file.

Navigate to the desired firmware to which you want to downgrade to, in this case it can be either iOS 4.3.3, 4.3.2, 4.3.1, 4.3 or 4.2.1. Once you find the required IPSW file, click “Open” and let iTunes do its thing.

In a matter of few minutes, iTunes will install the version of iOS which you directed it to install. At this point you should see a progress bar on your device, everything is automated, therefore don’t do anything silly. Your device will reboot automatically when everything is done.

In some cases, iTunes will throw 1013 error, ignore it, its perfectly normal when downgrading. At this point, your device will be in Recovery Mode with your desired version of iOS fully installed.

You should see a screen like the one below:

Its quite simple to get out of Recovery Mode, simply down this nifty program called TinyUmbrella (Windows, Mac) along with Fix Recovery (Windows, Mac).

Once you’re done downloading TinyUmbrella, launch it, and then click on the “Exit Recovery” button. In a matter of seconds, your device will boot up normally.

Once you’re done with this, the last thing you’re going to do is remove the line you added to the “host” file in step 3, which is 74.208.105.171 gs.apple.com in order to receive updates from Apple’s servers normally.