iPad iOS Firmware iPad ipsw firmware download that provided by Apple, when you do the relevant operation at your own risk.

iPad Air 3rd generation (10.5-inch)

iPad Air 3rd generation (10.5-inch) Type and Models :
  • iPad11,3
    • A2152
  • iPad11,4
    • A2123
    • A2153
    • A2154

The signed firmware that you can restore the file by MFC Software or by iTunes.