iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-10-30T17:05:54Z. The update package is 1.18 GB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dd12f382d9d236d95bb5a792716e170b2c174628.zip.