audioOS 9.9.15.1 (build 19J572) is an official Apple over-the-air update for the HomePod mini, released on 2021-10-25T17:12:30Z. The update package is 971.7 MB. This is a delta (partial) update that requires 14.7 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d4b7fe1873f74c5b36f0c432e38e3012265f9446.zip.