iPadOS 12.1.3 (build 16D5039a) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular), released on 2019-01-10T18:08:48Z. The update package is 324.2 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: 24266446078853ff07fe77e1cf0188b70d17bf95.zip.