audioOS 9.9.18.5 (build 22L572) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2025-05-12T17:13:44Z. The update package is 1.22 GB. This is a delta (partial) update that requires 17.4 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: a8cdfbf67f032a4cd33d82cdc55361bb15a5c40bd78e9958cb58e828b8724118.aea.