iPadOS 12.1.3 (build 16D5039a) is an official Apple over-the-air update for the iPad Pro (10.5-inch, WiFi), released on 2019-01-10T18:08:43Z. The update package is 226.26 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: ba46c9d51d8e2d1e29c8cbc992595fdf7fe1930f.zip.