iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-10-30T17:05:43Z. The update package is 1.22 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: 19a53a9d21fb2caf4cea94dbc59528c370218ba5.zip.