audioOS 9.9.15.1.1 (build 19J582) is an official Apple over-the-air update for the HomePod, released on 2021-11-03T17:10:19Z. The update package is 1.22 GB. This is a delta (partial) update that requires 13.4.8 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ee532a399a9042f384470ec3c4272dd55b4618f1.zip.