iPadOS 12.3 (build 16F5148a) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular), released on 2019-04-29T17:35:59Z. The update package is 152.77 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: 28047de8f0b17fec0135bb05c3ceb1098d3c4236.zip.