How to Downgrade 3Gs from 4.3.5 to 4.3.3 for repair No service

How to Downgrade 3Gs from 4.3.5 to 4.3.3 for repair No service

For downgrade 3Gs from 4.3.5 to 4.3.3 we need to …………..

Download
1- 3Gs 4.3.3 firmware from Here
2- Ireb4 from Here
3- Tiny Umbrella from Here
4- Snow Breeze 2.7 from Here
Now after download all Follow these step,s
1- Run Tiny software and connect Tethered jailbreak 3gs on ver 4.3.5 and save SHSH files, software should save shsh files for 4.3.5, 4.3.4, 4.3.3, 4.1 ver.
2- Now run Snow breeze and select 4.3.3 firmware and make custom restore firmware for 3Gs ver 4.3.3.it should paced on your computer desktop.
3- Now run IREB4 software and select iphone 3Gs and follow software instruction,s in the end your phone in DFU mode.
4- Run itunes software and Tiny umbrella software and start TSS server on Tiny Umbrella, your Itune should close automatically, that mean TSS server is working now.
5- Run ITUNES software again and restore your 3GS whith SHIFT+Restore 4.3.3 Firmware ver.
6- Itune take some time and your phone should restore to 4.3.3 downgrade ver from 4.3.5 ver.
7- Due to Custome restore file your phone complete on in Jailbreak condition.
8- Now run Cydia whith wifi and install repo666 application for signal repair.
That,s it now your phone in Untethered jailbreak condition whith full signal.