audioOS 9.9.17.1 (build 21K69) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2023-10-25T17:23:59Z. The update package is 1.14 GB. This is a delta (partial) update that requires 16.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: eaf0e767910f12cad61061b6ce21d4837c12e640.zip.