audioOS 9.9.18.5 (build 22L572) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2025-05-12T17:13:44Z. The update package is 1.28 GB. This is a delta (partial) update that requires 17.1 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: f98fd4397649bbb3fefbd8e17115ef5c5f8accc32786bffa3ac732f72bd11fbc.aea.