iPadOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2019-04-22T17:08:04Z. The update package is 370.86 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3a15a725b96c520a6acc7e6cf62271e868956927.zip.