iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2016-03-31T16:53:27Z. The update package is 436.8 MB. This is a delta (partial) update that requires 9.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 13c7132c3d280e069e06e3b5fbe3d213eb4b0ba9.zip.