iPadOS 12.4 (build 16G5027g) is an official Apple over-the-air update for the iPad Air 3 (WiFi), released on 2019-05-15T17:04:45Z. The update package is 263.14 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: f460ad18258ca672e6e24d7cdffe8b7b1d781b14.zip.