audioOS 9.9.16.4 (build 20L497) is an official Apple over-the-air update for the HomePod, released on 2023-03-27T17:13:08Z. The update package is 1.22 GB. This is a delta (partial) update that requires 15.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7433749259e6c17c42470983d08efe9abfd22269.zip.