iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-10-30T17:04:40Z. The update package is 310.5 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4782be4fc88dc837bba6c03ec2a6bf75b19addc9.zip.