iPadOS 12.4 (build 16G5027g) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2019-05-15T17:04:57Z. The update package is 205.28 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: f37c4e420446d3c6011cc841d7992bb8c3211b8a.zip.