iPadOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPad Air 3 (Cellular), released on 2019-05-07T17:03:32Z. The update package is 80.09 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: f9ba3263e3245fa2c186fa2b1c22d48c9d3c9c74.zip.