iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-10-30T17:05:40Z. The update package is 1.58 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3fe2ef606391f3562c54c3ae92a6d4fa9f3076b6.zip.