iPadOS 13.3.1 (build 17D5026c) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2019-12-17T18:13:01Z. The update package is 185.32 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: bbc7169885aa72b1304e8290fde7bfd408d2bdd1.zip.