audioOS 9.9.15.1

audioOS 9.9.15.1 (build 19J572) is an official Apple over-the-air update for the HomePod (Unknown Model), released on 2021-10-25T17:12:22Z. The update package is 1.22 GB. This is a delta (partial) update that requires 13.4.8 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 8446c768d203c0dddd9c708ed4a7f702c009f630.zip.