iPadOS 9.0 (build 13A344) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2015-09-16T18:02:13Z. The update package is 42.5 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 36a6db5e7f9ce7a3b8e9f45c90f394b8788aae8d.zip.