iPadOS 9.0.1 (build 13A404) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2015-09-23T17:55:17Z. The update package is 988.87 MB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: fd2267dd2eb758ca5fcd464916ad44a30c2d92e6.zip.