Download iOS 3.1.3 Build 7E18 IPSW Firmware Restore Files
Download the IPSW iOS 3.1.3 (Build 7E18) firmware file released at 22 January 2010 intended to restore iPhone 3G[S] via iTunes. IPSW iOS 3.1.3 build 7E18 is unsigned by Apple to update Apple device software.
