iPadOS 12.3 (build 16F5117h) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2019-03-27T17:06:04Z. The update package is 291.45 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: 9163adf25123501b1d4efe62e3f7163f6d9c0d90.zip.