iPadOS 9.9.13.4 (build 17E255) is an official Apple over-the-air update for the iPad Pro 4 (12.9-inch, WiFi), released on 2020-03-24T17:05:28Z. The update package is 3.13 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: c14f10cda62faba66e81d9b1c0a18446e8000ce8.zip.