iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-10-30T17:05:55Z. The update package is 1.18 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: 85e6282b30307dd53803ca9f152075bf8600c638.zip.