After lengthy search, I managed to downgrade my iphone 3GS From three.1.three to a few.1.2 with the brand new iBoot ,whereas I was once in my ECID three.1.three and was once no longer registered on the saurik server.
1 – Downloaded the firmware three.1.2 for your computer.
2 – Make sure that 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
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 y
our 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 the Original iPhone OS 3.1.3 firmware for iPhone 3GS.