audioOS 9.9.15.5 (build 19L570) is an official Apple over-the-air update for the HomePod, released on 2022-05-16T18:23:51Z. The update package is 543.66 MB. This is a delta (partial) update that requires 15.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 06aadffeccebf2d75e31dc69092624f6f20b357a.zip.