just to be clear do you want to jailbreak it or unlock it?
did you try googling your problem?
Used this myself worked beautifully:
Code:http://www.warez-bb.org/viewtopic.php?t=2802051
http://www.warez-bb.org/viewtopic.php?t=2802051
download the v4.3.3 From There & DO All like This.I have version 4.3.3 not v4.0 its much older version dude!
http://www.iphoneheat.com/2011/03/download-ios-4-3-firmware-iphone-4-3gs-ipad-2-1-ipod-touch-4g-3g/