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 50 MB. This is a delta (partial) update that requires 18.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 2bfa4a7cb2d37c00d445e9c5a5e176b7eb22caa51d3e4f28a76ecad949ea1bc6.aea.