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 223.08 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: d64088acfc35495796ff59265cd1c4639bd9d861.zip.