audioOS 9.9.17.3 (build 21K646) is an official Apple over-the-air update for the HomePod, released on 2024-01-22T18:29:26Z. The update package is 1.54 GB. This is a delta (partial) update that requires 15.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4e67572617f130e8bf100803ff180678ab2fadc4.zip.