iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-12-05T18:08:27Z. The update package is 1.25 GB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bcb1e1230d2ddb6459ad086987014fe0bd5697df.zip.