Simple And Easy Method :1st METHOD1.) Close iTunes2.) Download And Paste The Hosts File To: Click Here To Download In Mac OS
X /etc/hosts FOr DOwnload host Click Here In Windows past the host in to
"c:\windows\system32\drivers\etc\hosts"
( See the Download Section at the Bottom For host File )
3.) Put Your device in DFU mode.By turning your device off and then holding down the sleep and power button for 10 seconds, then release the power button but hold onto the home button until iTunes tells you that the device is now in recover mode
4.) Now Open iTunes and do shift+restore then select firmware
5.) Sit back and enjoy!!!
1. Download tiny umbrella( See the downloads Section at the bottom Tiny Umbrella)
2.Connect your device.
3.Start TSS server in TinyUmbrella put your device in DFU mode.By turning your device off and then holding down the sleep and power button for 10 seconds, then release the power button but hold onto the home button until iTunes tells you that the device is now in recover mode
4.Carry on the downgrade process But TSS server must be running Throughout The whole process.
5. Enjoy your downgraded phone!