audioOS 9.9.18.6 (build 22M84) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2025-07-29T17:28:06Z. The update package is 832 MB. This is a delta (partial) update that requires 18.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 92e181a16e81163df4af79e07da4bc720c44032b67d7d5c3dd6c33624f1b0b3c.aea.