iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2017-12-13T18:08:13Z. The update package is 527.04 MB. This is a delta (partial) update that requires 11.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a57e84c256bd932e8d788e50e2e3c4b1ae513be5.zip.