iPadOS 12.3 (build 16F5148a) is an official Apple over-the-air update for the iPad Air 3 (Cellular), released on 2019-04-29T17:35:21Z. The update package is 149.11 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: f0285e30f310046b3bb40d676cd36b466d74482b.zip.