audioOS 9.9.18.2 (build 22K155) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2024-12-11T18:26:06Z. The update package is 1.31 GB. This is a delta (partial) update that requires 17.1.1 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: c8c733ffef412dc8a533718496ae62c5854010551a81bcc0697612c25bba281e.aea.