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 5s (GSM) via iTunes. IPSW iOS 10.3.1 build 14E304 is unsigned by Apple to update Apple device software.