iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2017-12-13T18:08:08Z. The update package is 1.1 GB. This is a delta (partial) update that requires 10.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b8bbedb0152243d911ef0406d38b7bd812c2c563.zip.