iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-12-05T18:07:15Z. The update package is 1.57 GB. This is a delta (partial) update that requires 10.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 326db62130282f078340b3369c6f5110ef2c3218.zip.