audioOS 9.9.17.3 (build 21K646) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2024-01-22T18:29:37Z. The update package is 1.14 GB. This is a delta (partial) update that requires 16.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d4426071f9440daa87f8f5728ed02475322b0bbf.zip.