iPadOS 12.1 (build 16B5077c) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-10-09T17:05:26Z. The update package is 355.23 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: 72b0103fcdbc1ccafefed796ff719c021bd97061.zip.