audioOS 9.9.17.4 (build 21L227) is an official Apple over-the-air update for the HomePod, released on 2024-03-07T18:16:25Z. The update package is 768.71 MB. This is a delta (partial) update that requires 17.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9cff1ffc5624fca4880f53ab2dd365bbcf13c671.zip.