audioOS 9.9.15.4 (build 19L440) is an official Apple over-the-air update for the HomePod, released on 2022-03-14T17:12:31Z. The update package is 1.01 GB. This is a delta (partial) update that requires 14.7 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b075d632fa9c32cb855a0de29caa64badecbd79c.zip.