How to: Downgrade iPhone 3GS From 3.1.3 to 3.1.2 with the new iBoot

After long search, I managed to downgrade my iphone 3GS From 3.1.3 to 3.1.2 with the new iBoot ,while I was in my ECID 3.1.3 and was not registered on the  saurik server. 

1 - Downloaded the firmware 3.1.2 on your pc. 

2 - Make sure the iTunes is updated to the latest version

3 - Do a SHIFT + click on the button "Restore". 

4 - Downgrade occurs at the end of 3 / 4 of loading, an error (1015), click "OK" and close itunes. itunes logo + USB port appear. 

5 - Install libusb-win32 (libusb-win32-filter-bin-0.1.12.2.exe), then launch console iRecovery.exe. you find here 

6 - Make a iRecovery.exe-s to fit in the shell of the iphone 

7 - Once in the shell, type their commands: 

setenv auto-boot true 

saveenv 

/ exit 

8 - Reboot the iphone with the buttons HOME + SLEEP (10sec) 

  

 

- Your iphone should have the iPhone 3GS firmware and you can follow our complete jailbreaking guide for  guide for iPhone 3.1.2 3Gs using blackran1. Yyou can then unlock your iPhone using ultrasn0w.

- For iRecovery.exe launches in console mode, start menu> run> cmd> then Desktop iRecovery.exe (eg if your file is on the desktop) 

-  If you're on Seven or vista, put in compatibility mode "Windows XP SP2, and run in administrator mode. 

Download  libusb + iRecovery 

Download iRecovery

Download the Original iPhone OS 3.1.3 firmware for iPhone 3GS.

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