iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2017-12-13T18:06:41Z. The update package is 54.86 MB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 001e919fff28315d80e77080cfbcc2903714cd22.zip.