iPadOS 12.4 (build 16G5077a) is an official Apple over-the-air update for the iPad Air 3 (WiFi), released on 2019-07-16T17:38:54Z. The update package is 123.38 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: 594d4ea7ca60d58189354ed7f5bbb557e6eb6e7d.zip.