iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-12-05T18:07:17Z. The update package is 1.16 GB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 46530bde6cd3d7801f849c6529369d3d188597b7.zip.