iPadOS 12.1 (build 16B5084a) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2018-10-15T17:02:58Z. The update package is 356.25 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 61327e53ad8e598bf9bebb215d7e980b9c665990.zip.