audioOS 9.9.17.2 (build 21K365) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2023-12-11T18:21:43Z. The update package is 1.15 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: f8f6b339dc2928779bcfb278a63fd2e12b754ae1.zip.