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 1.21 GB. This is a delta (partial) update that requires 15.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f8407b3f9436b622ce7fe0fff2c023a58876f6a3.zip.