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 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: d5f2b96f24a5ea8938b887c3fd73064b843f275e.zip.