iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-10-30T17:05:30Z. The update package is 330.98 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: 211969fb50f8efe7ca9607187e0da3bdef7d7a23.zip.