iPadOS 12.1.1 (build 16C5036c) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2018-10-31T17:03:34Z. The update package is 259.25 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 19b918222e4412bc9660ba5e5f15eae6c809880d.zip.