audioOS 9.9.15.3 (build 19K547) is an official Apple over-the-air update for the HomePod, released on 2022-01-26T18:16:45Z. The update package is 1.09 GB. This is a delta (partial) update that requires 14.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b5dc01e6c48f7f3c34bbf5ce7a46550cba059f0b.zip.