iPadOS 9.3.1 (build 13E6238) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2016-03-31T16:50:20Z. The update package is 1.19 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c44262df33d648bb69ad8572b50eaad4f3a892c3.zip.