iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-12-05T18:08:25Z. The update package is 1.6 GB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a543d999d5a0e88576f7d5755736a099ddedf794.zip.