audioOS 9.9.18.6 (build 22M84) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2025-07-29T17:28:05Z. The update package is 1.22 GB. This is a delta (partial) update that requires 17.6 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 344db4ffa15b84427625ca353230328fab7299d55437a7508a6a359c4ee55ce3.aea.