Download iPadOS 9.2.1 Build 13D15 IPSW Firmware Restore Files
Download the IPSW iPadOS 9.2.1 (Build 13D15) firmware file released at 19 January 2016 intended to restore iPad Air (WiFi) via iTunes. IPSW iPadOS 9.2.1 build 13D15 is unsigned by Apple to update Apple device software.