How To Downgrade From iOS 4.3.5 to iOS 4.3.3 Without Saving SHSH Blobs :

Required downloads :

Download iOS 4.3.3 Firmware .

Download Redsn0w 0.9.8b5.

Download sn0wbreeze-v2.7.3.

Download Tinyumbrella 5-00-11 .

Download iFaith .

Download Fix recovery.

Step 1: Go to this directory C:WindowsSystem32driversetc , and open host file and be sure that it ends by  ( 74.208.105.171 gs.apple.com ) as shown below :

Step 2: Now start Redsn0w and Follow these steps,1- browse for the iOS 4.3.3 firmware file (NOT the 4.3.5) as shown below

2-Then Select “Install Cydia” Then hit Next

3-Another screen should now pop up. Before clicking “Next”, make sure your device is both turned off and plugged in, as instructed by Redsn0w.

4-You’ll now be instructed to enter DFU mode. As shown below, Quickly hold “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.

Now your finish ,don’t do any thing ,Redsn0w does the rest of the work for you.(If you are in recovery mode , it’s OK don’t worry)

Step 3:Start TinyUmbrella 5-00-11 and Hit Start TSS Server 

Step 4:Start iTunes, click on your iOS device icon from the sidebar in iTunes. Now press and hold Left “Shift” button on the keyboard and then click on “Restore”  button in iTunes and then release this button and point iOS 4.3.3 firmware file.

If you got a recovery mode after the redsn0w you will see this window :

Don’t worry it’s normal just Click OK and press and hold Left “Shift” button on the keyboard and then click on “Restore”  button in iTunes and then release this button and point iOS 4.3.3 firmware file.

Note:In this step If you got iTunes error 1013 or 1015 follow this steps to fix it :

1-Start Fix Recovery and enter DFU mode. Hold “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.

Now Fix Recovery will start , just wait .

2-Now start iFaith Dump SHSH Blobs button

3- Hit the Proceed button, followed by Let’s Go! until iFaith asks you to power off your device

4-Now iFaith will ask you to enter DFU mode. (Follow the instructions)

Now don’t do any thing iFaith will take care of the rest.

5-Now iFaith will ask you to choose a location to save the file.

After Click Save you will see this message.

Step 5: Close TinyUmbrella and Start Sn0wbreeze-v2.7.3 and follow this steps:

1-Click the next “blue” colored arrow to proceed.

2-Select the required firmware(iOS 4.3.3) .ipsw file for your iOS device by clicking on the “Browse” button.

3-Sn0wbreeze will now identify the selected IPSW file. Once done, click the next “blue” colored arrow to proceed.

4- Now select the “Expert Mode”, followed by “Build IPSW” option to start creating your custom firmware.

5-Sn0wbreeze will greet you with the following “Done!” message when the custom firmware has been successfully created.

6-Now follow the onscreen steps to enter DFU mode using Sn0wbreeze after turning your device off.(Press and Hold “Home” Button and “Power” Button for 10 seconds Then release “Power” button but keep holding “Home” button until installation begins.

If you have followed the steps correctly sn0wbeeze will run iREB .