iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2017-12-13T18:08:14Z. The update package is 356.05 MB. 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: 98ca32e5c409d2302bfe1b6eb78b99ea1855b237.zip.