iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad 4 (GSM), released on 2016-03-31T16:52:25Z. The update package is 362.07 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4e2a3e69ec622e7500e01ba5e3eb5d13bd606aec.zip.