iPadOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2017-04-03T17:00:06Z. The update package is 564.4 MB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 664497526da64fc221083d46757a706c81db3fcc.zip.