iPadOS 12.3 (build 16F5117h) is an official Apple over-the-air update for the iPad Pro 2 (12.9-inch, Cellular), released on 2019-03-27T17:06:10Z. The update package is 306.34 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: fcc3100bf42c0bdf2d51d08cf8997292445ef87d.zip.