audioOS 9.9.18.6 (build 22M84) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2025-07-29T17:28:02Z. The update package is 1.47 GB. This is a delta (partial) update that requires 16.4 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 7d2618639d351de66396abe2cf1b2a4cde1116ec6345b70e0380d5da9cd001d3.aea.