iPadOS 12.4 (build 16G5056d) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2019-06-24T17:16:48Z. The update package is 188.22 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: 9f55aaf6c9b26b75a9a324f9d3245bfbc3894bf0.zip.