audioOS 9.9.18.3 (build 22K557) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2025-01-27T18:19:52Z. The update package is 1.22 GB. This is a delta (partial) update that requires 17.6 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 7b2736d2023a1d2716abd143954ee2c92b23757d424562c488e043d0a179f761.aea.