audioOS 9.9.16.3.1 (build 20K661) is an official Apple over-the-air update for the HomePod (Unknown Model), released on 2023-02-06T18:19:54Z. The update package is 1.53 GB. This is a delta (partial) update that requires 13.4.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7c8cd3c046d9b87e0bfe3f5a941dd3939cd84e5b.zip.