How to Put an iPhone or iPod Touch into DFU Recovery Mode
Here's how to enter recovery mode on your iPhone or iPod touch the easy way. No need to press the sleep button and the home button at the same time for x amount of seconds, just turn your device off, if the device is frozen and can't be turned off normally just hold the above buttons until it turns off, now press and hold the home button and plug the device in. Do not let go of the home button until you see a screen in which the connector cable is displayed and there is an arrow pointing from the cable towards what seems like a disc. If you see this image then it means you've successfully entered recovery mode.