Download iOS 4.2.8 Build 8E401 IPSW Firmware Restore Files
Download the IPSW iOS 4.2.8 (Build 8E401) firmware file released at 02 May 2011 intended to restore iPhone 4 (CDMA) via iTunes. IPSW iOS 4.2.8 build 8E401 is unsigned by Apple to update Apple device software.