audioOS 9.9.15.4.1

audioOS 9.9.15.4.1 (build 19L452) is an official Apple over-the-air update for the HomePod (Unknown Model), released on 2022-03-31T17:16:03Z. The update package is 1.24 GB. This is a delta (partial) update that requires 13.4.6 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 efcc5a5904fe8bb1d45082363f89e1d1e8286fb8.zip.