iPadOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2019-01-22T18:06:04Z. The update package is 1.23 GB. This is a delta (partial) update that requires 11.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7660a2e16ac6888a941652634333a99b9090f284.zip.