iPadOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2019-04-22T17:08:02Z. The update package is 271.12 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: 83eabe87e4c494c7638c5477308e0f30f667df0d.zip.