iPadOS 12.4 (build 16G5038d) is an official Apple over-the-air update for the iPad Air 3 (WiFi), released on 2019-05-28T17:06:57Z. The update package is 283.51 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: d3d3cca7594ca1ae6311ffbe09402db2707f5e19.zip.