iPadOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2019-01-22T18:05:39Z. The update package is 1.25 GB. This is a delta (partial) update that requires 11.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 03b267840ba03bad5ffb7bc232e9cc74deba0b4e.zip.