iPadOS 12.0 (build 16A366) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-09-12T19:05:59Z. The update package is 1.6 GB. This is a delta (partial) update that requires 10.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 493429f5a4ac3c547c6b9bb91b72e6b110cbcf10.zip.