After downloading the desired firmware below, you can shift-click (PC) or option-click (Mac) theRestore or Update buttons in iTunes. A file dialog will open and let you choose the downloadedipsw-file.
Note: Your browser may change the ipsw-file into a zip-file. In that case, just rename it to end in.ipsw and iTunes will accept it.
iPhone 2G | |
iPhone 3G | |
iPhone 3Gs | |
iPhone 4 ( GSM ) iPhone 4 ( Verizon / CDMA ) | |
iTouch
| |
iTouch 2G | |
iTouch 3G | |
iTouch 4G | |
iPad | |
iPad 2 ( WiFi ) iPad 2 ( GSM ) iPad 2 ( CDMA ) | |
AppleTV |