iPadOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2019-01-22T18:05:23Z. The update package is 1.27 GB. This is a delta (partial) update that requires 11.0.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 912c512ca95bd2a5294b151bc3e03f755313df73.zip.