audioOS 9.9.17.0 (build 21J354) is an official Apple over-the-air update for the HomePod, released on 2023-09-18T17:26:28Z. The update package is 1.19 GB. This is a delta (partial) update that requires 16.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5c57728b95f8c77d1568c142e2bac265cbbed453.zip.