audioOS 9.9.18.4.1

audioOS 9.9.18.4.1 (build 22L261) is an official Apple over-the-air update for the HomePod, released on 2025-04-16T17:28:26Z. The update package is 1.99 GB. This is a delta (partial) update that requires 13.4.5 to already be installed on the device - it cannot be applied from scratch. This update is no longer signed by Apple, meaning it can no longer be downloaded and applied on-device through Settings.

The OTA payload file is 8f2a28c43e7221320b4caabcdbb7db7e4ad8ebd3.zip.