iPadOS 9.9.13.1 (build 17A5831c) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular, 1TB Model), released on 2019-09-04T17:06:02Z. The update package is 3.08 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: 882b9f1a235d95aade74ab34663e9f466a3f5188.zip.