iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad mini 2 (Cellular), released on 2017-12-13T18:05:33Z. The update package is 327.24 MB. This is a delta (partial) update that requires 11.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 07b83dcd643ba2428deaa6f5a6e799eb60d58aba.zip.