iPadOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPad Air 3 (WiFi), released on 2019-04-08T17:03:52Z. The update package is 317.95 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: 7ce3f37c4513e6e5b7b83dd9e2f3c6a4016dfabf.zip.