audioOS 9.9.15.3 (build 19K547) is an official Apple over-the-air update for the HomePod mini, released on 2022-01-26T18:16:57Z. The update package is 1.09 GB. This is a delta (partial) update that requires 14.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4f8550321fd85de5597a41b1b2faf429f94fc05a.zip.