Download iOS 4.0.1 Build 8A306 IPSW Firmware Restore Files
Download the IPSW iOS 4.0.1 (Build 8A306) firmware file released at 13 July 2010 intended to restore iPhone 3G[S] via iTunes. IPSW iOS 4.0.1 build 8A306 is unsigned by Apple to update Apple device software.