Download iOS 13.1.3 Build 17A878 IPSW Firmware Restore Files
Download the IPSW iOS 13.1.3 (Build 17A878) firmware file released at 15 October 2019 intended to restore iPhone 8 Plus (GSM) via iTunes. IPSW iOS 13.1.3 build 17A878 is unsigned by Apple to update Apple device software.