iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2017-12-13T18:06:59Z. The update package is 355.48 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 41be2693b694b4cc9f3e9a2b6213d2465b7b2dd5.zip.