iPadOS 9.0.1 (build 13A404) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2015-09-23T17:55:20Z. The update package is 1.18 GB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c3199676809bc82425c204f6944fa7eccc276388.zip.