audioOS 9.9.18.1 (build 22J580) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2024-10-28T15:30:18Z. The update package is 1.38 GB. This is a delta (partial) update that requires 16.5 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: d5f02f696d04b8c73387f0ad5316da9791a2faa34a6b6e971c1a5c4c04ce3331.aea.