iPadOS 12.4 (build 16G5027g) is an official Apple over-the-air update for the iPad Air 3 (Cellular), released on 2019-05-15T17:04:46Z. The update package is 267.4 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: 3e14acdf41d57455bf2eb5bc2b98e087631c6ee3.zip.