iPadOS 15.7.4 (build 19H321) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2023-03-27T17:11:42Z. The update package is 2.2 GB. This is a delta (partial) update that requires 14.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c53c7e3b918ec3750e8c16f43973e36ed799e0c2.zip.