iPadOS 12.1.3 (build 16D5032a) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular, 1TB Model), released on 2018-12-19T18:06:52Z. The update package is 283.83 MB. This is a delta (partial) update that requires 12.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d3dfcaef07e555135f8bd0f68187a09a87c3bced.zip.