iPadOS 12.4 (build 16G5077a) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2019-07-16T17:38:59Z. The update package is 279.7 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: 86fa2eb0505c0baf0928ce786244665051de578e.zip.