iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-10-30T17:05:56Z. The update package is 332.28 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 24dfb0b8fe88e7bcbe2adec13d5bb0c576e64f97.zip.