Download iOS 6.1.3 Build 10B329 IPSW Firmware Restore Files
Download the IPSW iOS 6.1.3 (Build 10B329) firmware file released at 13 March 2013 intended to restore iPhone 4 (GSM) via iTunes. IPSW iOS 6.1.3 build 10B329 is unsigned by Apple to update Apple device software.