audioOS 9.9.15.4.1 (build 19L452) is an official Apple over-the-air update for the HomePod, released on 2022-03-31T17:15:59Z. The update package is 1.01 GB. This is a delta (partial) update that requires 14.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 62846100f07a0302f7d57a62d043a0ec3306e9f6.zip.