iPadOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, WiFi), released on 2019-05-07T17:04:04Z. The update package is 79.95 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d50caa8d94afbe8fd3e6d2d965041dfa3a4be2b0.zip.