audioOS 9.9.15.3 (build 19K547) is an official Apple over-the-air update for the HomePod, released on 2022-01-26T18:16:46Z. The update package is 271.63 MB. This is a delta (partial) update that requires 15.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8e94a7464e9ee20df58f8eb568473fcbb0927bf2.zip.