iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2017-12-13T18:06:08Z. The update package is 526.52 MB. This is a delta (partial) update that requires 11.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: aa1723520778216d29973003f193392858b6930b.zip.