audioOS 9.9.16.6 (build 20M73) is an official Apple over-the-air update for the HomePod, released on 2023-07-24T17:29:59Z. The update package is 1.19 GB. This is a delta (partial) update that requires 15.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d30baad6c9b0c59e4d33ec10790665acf56c33f2.zip.