iPadOS 12.1 (build 16B5089b) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-10-22T17:01:32Z. The update package is 133.58 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 14cd8995daf3f31e18b88f2c9c0a62b705f5402f.zip.