iPadOS 12.1.3 (build 16D5032a) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2018-12-19T18:06:32Z. The update package is 215.91 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 800aa23dfb02a5e5b1c0bf359fcbf03d92b1bd96.zip.