audioOS 9.9.18.0 (build 22J357) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2024-09-16T17:25:26Z. The update package is 1.38 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: bc394f9c9b31e22b6f864574a550db57002e4f95d5294100f7b187106d2e7513.aea.