iPadOS 13.3.1 (build 17D5026c) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular), released on 2019-12-17T18:13:15Z. The update package is 214.3 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: 58165550b891fb8e177eaf7a91b6091003863216.zip.