audioOS 9.9.18.5 (build 22L572) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2025-05-12T17:13:41Z. The update package is 1.47 GB. This is a delta (partial) update that requires 16.3.1 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 94d9481cff1ca8769a6e99c30e31b38d112a106026b9642d4e34c56d44a52a20.aea.