audioOS 9.9.15.3 (build 19K547) is an official Apple over-the-air update for the HomePod, released on 2022-01-26T18:16:43Z. The update package is 1.19 GB. This is a delta (partial) update that requires 13.4.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b385fc92c8c3f3336a5a690e82d514d8f8b0c075.zip.