audioOS 9.9.16.4 (build 20L497) is an official Apple over-the-air update for the HomePod, released on 2023-03-27T17:13:04Z. The update package is 1.56 GB. This is a delta (partial) update that requires 13.4.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3072c51e91ed9d6799d72001aedfc613995e454e.zip.