iPadOS 12.2 (build 16E5191d) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2019-02-04T18:05:48Z. The update package is 626.14 MB. This is a delta (partial) update that requires 12.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 648a758a9e50ff692a8eed4ac1579107e6f7c5fe.zip.