iPadOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular), released on 2019-05-07T17:04:02Z. The update package is 473.66 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: 1a5f356b050cd74fc8ee0c6bc9e80052faa37559.zip.