audioOS 9.9.13.2 (build 17B84) is an official Apple over-the-air update for the HomePod, released on 2019-10-28T17:19:01Z. The update package is 939.72 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4768104dbd74d2b0d0e3d9b57b1939ddcff1a9c6.zip.