Download iOS 4.3.1 Build 8G4 IPSW Firmware Restore Files
Download the IPSW iOS 4.3.1 (Build 8G4) firmware file released at 24 March 2011 intended to restore iPhone 4 (GSM) via iTunes. IPSW iOS 4.3.1 build 8G4 is unsigned by Apple to update Apple device software.
