audioOS 9.9.16.6 (build 20M73) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2023-07-24T17:30:18Z. The update package is 596.85 MB. 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: 4d3d70d7aa48afb5f487bc56e326741848713a26.zip.