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 355.53 MB. This is a delta (partial) update that requires 11.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 26a819899c3ec2cd6de3059a78dc23317d920fb2.zip.