iPadOS 12.4 (build 16G5038d) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2019-05-28T17:06:59Z. The update package is 194.08 MB. This is a delta (partial) update that requires 12.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4b855a39a70709fbb5d74f3d47b63bb17d6623b3.zip.