iPadOS 12.1.3 (build 16D5032a) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular), released on 2018-12-19T18:06:49Z. The update package is 321.47 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f16b099574fe1a0dc84c0c9aeedb32728087adac.zip.