iPadOS 12.4 (build 16G5056d) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2019-06-24T17:16:52Z. The update package is 282.7 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: 43df980ed02e1b9717ed23d85e2131514c85c4d5.zip.