audioOS 9.9.15.4.1 (build 19L452) is an official Apple over-the-air update for the HomePod mini, released on 2022-03-31T17:16:14Z. The update package is 46.74 MB. This is a delta (partial) update that requires 15.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 39ed29b5f0499103dcb8edfc9cc83d38698bae98.zip.