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

iPad Pro 4 (11-inch)

iPad Pro 4 (11-inch) Type and Models :
  • A2228
    • iPad8,9
  • A2068, A2230,A2231
    • iPad8,10

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