Download MacOS 12.3.1 Build 21E258 IPSW Firmware Restore Files
Download the IPSW MacOS 12.3.1 (Build 21E258) firmware file released at 31 March 2022 intended to restore iMac 24-inch (M1, Two Ports, 2021) via iTunes. IPSW MacOS 12.3.1 build 21E258 is signed by Apple to update Apple device software.
