iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-10-30T17:05:47Z. The update package is 332.25 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7e2c52cc831e20ea56b325eb5e430d1195c4affe.zip.