Download iOS 10.3.1 Build 14E304 IPSW Firmware Restore Files
Download the IPSW iOS 10.3.1 (Build 14E304) firmware file released at 03 April 2017 intended to restore iPhone 5 (GSM) via iTunes. IPSW iOS 10.3.1 build 14E304 is unsigned by Apple to update Apple device software.