audioOS 9.9.17.4 (build 21L227) is an official Apple over-the-air update for the HomePod, released on 2024-03-07T18:16:21Z. The update package is 1.29 GB. This is a delta (partial) update that requires 16.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: aa812c4dd84ec10e2f99879ea2ac9855d3a4c41b.zip.