audioOS 9.9.15.5.1 (build 19L580) is an official Apple over-the-air update for the HomePod mini, released on 2022-05-25T17:17:07Z. The update package is 412.71 MB. This is a delta (partial) update that requires 15.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2e0361a1f95de98d44c42bc7a1577530261171b1.zip.