iPadOS 12.4 (build 16G5046d) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2019-06-11T17:07:02Z. The update package is 271 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: e5e4d676c663756323e104fc1df2b8ab3b25c989.zip.