iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-12-05T18:08:17Z. The update package is 1.23 GB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f8c69db9c41a3078cdd89a439815019bc18d6812.zip.