Put into DFU mode- (NOT RECOVERY) this guide will show you how-
PLUG DEVICE INTO PERSONAL COMPUTER
Turn device OFF completely while plugged into computer (hold home and power buttons at same time)
Hold the power button until the logo appears, continue holding power button
While still holding power button, tap and hold the home button
Wait for device to turn off
When it turns off, remove finger from POWER button, but continue holding the home button.
iTunes will say it detected a device in recovery mode
Hit restore
Wait until restore is complete, then restore from backup