iPadOS 9.9.13.5.1 (build 17F80) is an official Apple over-the-air update for the iPad Pro 4 (12.9-inch, Cellular), released on 2020-06-01T17:10:59Z. The update package is 3.21 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1b18404b1f7660b2ca127f828d8229a5c383362b.zip.