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 1.01 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: 51acd0f6a41702637b9478691962e7b20e8622b0.zip.