audioOS 9.9.18.6 (build 22M84) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2025-07-29T17:28:04Z. The update package is 1.25 GB. This is a delta (partial) update that requires 17.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: fb61f78c923cf6dcb9f0021a18debbc4be02b09a822a6814063c624ed98da147.aea.