iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2018-10-30T17:04:33Z. The update package is 1.16 GB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c002589e4071f77a8e23d95d78448f0797ce2b4e.zip.