iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2017-12-13T18:03:44Z. The update package is 51.63 MB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 85ba49beaf9782b3112ea72fc329474caa376e53.zip.