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 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: df15ca5f4da6ba83d09a31b57638c86b65222651.zip.