iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad Air (China), released on 2016-03-31T16:52:58Z. The update package is 436.59 MB. This is a delta (partial) update that requires 9.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a9005f62dcd4874eb507fa7dc8c5d0884093c58f.zip.