iPadOS 13.3.1 (build 17D5044a) is an official Apple over-the-air update for the iPad Air 3 (WiFi), released on 2020-01-14T18:20:30Z. The update package is 195 MB. This is a delta (partial) update that requires 13.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c68f04b0bd17469c1e7ead4ac4f2adc4c558de68.zip.