Downgrade iOS 4.3.4/iOS 5 to 4.3.3 without any SHSH backup

1. First find the hosts c:/windows/system32/drivers/etc (open with Notepad), copy the hosts file to avoid error.
Note: (Windows7 users, please start – All Programs – Accessories – Notepad right to run as administrator and then open the hosts file) deleting all the content in hosts file, then copying the 74.208.10.249 gs.apple.com into which, save.

2. And then open the itunes and connect device to the computer, connecting itunes into DUF mode. (Note that not recovery mode, can not appear a connection to itunes chart on the screen ) Please order – hold the POWER button for 3 seconds – hold down the POWER + HOME button for 10 seconds – just release POWER and press the HOME key for 15 seconds later, when the screen becomes black, successfully entered the DUF. Then iTunes will there have a iPhone need to restore, click OK, then press Shift + restore button to select the 4.3.3 firmware. After the recovery may be out of the error, do not bother about it (attention must not to tap OK).

3. Then coming the most important steps, running FixRecovery43 process, and it will automatically turn off iTunes. Please re-enter the DUF mode. Then let the program running themselves, iPhone screen will also appear a lot of code. Do not be afraid, some long loading time, please wait, after well you need activate your device with iTunes. When your device successfully restored to 4.3.3 firmware, you can jailbreak it again.