audioOS 9.9.15.2 (build 19K52) is an official Apple over-the-air update for the HomePod mini, released on 2021-12-13T18:28:31Z. The update package is 1002.09 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: a8f9d65ca15cc3867391cf27d990f5ded7c66190.zip.