iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-10-30T17:05:45Z. The update package is 1.18 GB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1b7e82528844aa5d7cbb36ab6e43d64c0bcfe7e6.zip.