iPadOS 9.0 (build 13A344) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2015-09-16T18:02:09Z. The update package is 1 GB. This is a delta (partial) update that requires 8.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 809af8261e995ae2f825a0b4cbdbba94f0ab5272.zip.