iPadOS 9.9.11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2017-12-13T18:07:40Z. The update package is 1.25 GB. This is a delta (partial) update that requires 9.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8794ea2215506a6d7fcac99dbb88eda7b6c1514f.zip.