iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2017-12-13T18:07:50Z. The update package is 55.42 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: 045660ac6cd8b69c71aed9c37267b70c00dbb712.zip.