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 527.03 MB. This is a delta (partial) update that requires 11.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 093837fbd1e9299b399e942918dae17a60a84adb.zip.