iPadOS 9.1 (build 13B5143) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2015-10-21T17:15:46Z. The update package is 1.33 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: 0eba6bfda059618541b308b58255f764baaab519.zip.