iPadOS 9.3 (build 13E233) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2016-03-21T18:55:44Z. The update package is 1 GB. This is a delta (partial) update that requires 8.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 694e1cf2f5a55b1da6b6ad08d4ddf1e13a1d91f9.zip.