audioOS 9.9.15.2 (build 19K52) is an official Apple over-the-air update for the HomePod mini, released on 2021-12-13T18:28:30Z. The update package is 1007.6 MB. This is a delta (partial) update that requires 14.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ef7dffc87a51b6ab6e6bd4b3e9367a6713448b36.zip.