iPadOS 9.9.13.1 (build 17A5844a) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2019-09-18T17:06:28Z. The update package is 2.58 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: 63f40276a290f8d301577fe717bf9fe9f2eab033.zip.