iPadOS 12.3 (build 16F5117h) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2019-03-27T17:05:51Z. The update package is 311.67 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: 5460b4009aa63ef8b7c1aad809601f59d664e8eb.zip.