iPadOS 12.4 (build 16G5038d) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2019-05-28T17:07:04Z. The update package is 195.77 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: 3ee8581450a1e11329661ab045b41767aec4e2a1.zip.