iPadOS 12.3 (build 16F5117h) is an official Apple over-the-air update for the iPad mini 2 (WiFi), released on 2019-03-27T17:05:44Z. The update package is 287.59 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: 669052a262097eb9259d5d38def3417fc39f2ec8.zip.