iPadOS 13.3.1 (build 17D5026c) is an official Apple over-the-air update for the iPad 6 (WiFi), released on 2019-12-17T18:13:11Z. The update package is 226.3 MB. This is a delta (partial) update that requires 13.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4c9c585e18c8b1f9876c1479b7776eb33ed24edf.zip.