Step 1: You have to go to C:\Windows\System32\drivers\etc , and replace "HOST" file with the downloaded one in "Restore Files" folder
Step 2: Open redsn0w and jailbreak your device, you can follow this tutorial - Click Here - but you have to point to iOS 4.3.3 instead of 4.3.4.
Step 3: Then the iPhone will stop on the recovery mode.
Step 4: Open Tinyumbrella (can be found in "Restore Files" folder above), then click on your iPhone name at the left then press on Start Tss Server.
Step 5: Open iTunes and restore your iPhone with iOS 4.3.3 firmware (Shift + Restore) then close it.
Step 6: You will find error 1013, at this time you have to use Fixrecovery (can be found in "Restore Files" folder above).
Step 7: Open iFaith (can be found in "Restore Files" folder above) and Save shsh file.
Step 8: Open sn0wbreeze (can be found in "Restore Files" folder above) to create custom iOS 4.3.3 firmware and restore with it. Done.
Note: We have not had a chance to verify this guide, so if you gonna try it, please feed us back, specially iPad 2 users.