audioOS 9.9.17.3 (build 21K646) is an official Apple over-the-air update for the HomePod, released on 2024-01-22T18:29:29Z. The update package is 1.12 GB. This is a delta (partial) update that requires 16.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4b72e603969102bff893b1285417ec3d706e7d3d.zip.