iPadOS 12.4 (build 16G5027g) is an official Apple over-the-air update for the iPad Air (China), released on 2019-05-15T17:04:47Z. The update package is 203.08 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: 7608b62d8d4b42af42743654ecaeed6ff8e64a17.zip.