iPadOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular), released on 2019-04-22T17:08:37Z. The update package is 382.07 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: cea24d2a33223c1c5a01e7638cfd3444148ad138.zip.