iPadOS 12.1 (build 16B5089b) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2018-10-22T17:01:30Z. The update package is 356.52 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: 5403f809ca73cb1395ada838924fc62f5d5bc47c.zip.