audioOS 9.9.16.6 (build 20M73) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2023-07-24T17:30:19Z. The update package is 213.48 MB. This is a delta (partial) update that requires 16.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 37fbf49bc1b2c29fe678665ddfa92876fa35d112.zip.