iPadOS 9.0.1 (build 13A404) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2015-09-23T17:55:18Z. The update package is 1.4 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 04ac8edc5b462aa23d76f731a5aa61b004691188.zip.