audioOS 9.9.15.2 (build 19K52) is an official Apple over-the-air update for the HomePod mini, released on 2021-12-13T18:28:29Z. The update package is 1.14 GB. This is a delta (partial) update that requires 14.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5a7af9eec9de7cf4dfdbbdb210e90e48b202b177.zip.