iPadOS 9.0.1 (build 13A404) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2015-09-23T17:55:18Z. The update package is 1.15 GB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 062412e611a16ed1f8aea5240f4903261440e215.zip.