iPadOS 12.0 (build 16A366) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2018-09-12T19:06:13Z. The update package is 1.18 GB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 52ab922de381c92882cd36d8974baebe6d02bc0f.zip.