audioOS 9.9.15.4.1 (build 19L452) is an official Apple over-the-air update for the HomePod, released on 2022-03-31T17:15:55Z. The update package is 1.24 GB. This is a delta (partial) update that requires 13.4.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: fe6250c69c91aae56d0c149e70f1c71289a273d2.zip.