iPadOS 12.1.3 (build 16D5037a) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, WiFi, 1TB Model), released on 2019-01-07T18:07:01Z. The update package is 132.48 MB. This is a delta (partial) update that requires 12.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 17f59d5c332504596f15c3acdf012b56f6c333dd.zip.