audioOS 9.9.16.4 (build 20L497) is an official Apple over-the-air update for the HomePod, released on 2023-03-27T17:13:11Z. The update package is 568.53 MB. This is a delta (partial) update that requires 16.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1fbf16c87ad405ca18e9dbb36b9dacd9b1dc496c.zip.