iPadOS 9.3 (build 13E233) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2016-03-21T18:55:59Z. The update package is 1.15 GB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 475740c8a8d88b4101e0ce431e85866e4a0d674c.zip.