audioOS 9.9.17.4

audioOS 9.9.17.4 (build 21L227) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2024-03-07T18:16:31Z. The update package is 1.23 GB. This is a delta (partial) update that requires 16.3.2 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 5510fed7b7cd1ab9f7e0dd9e5ffc0b6e17b1dc05.zip.