audioOS 11.4 (build 15F80) is an official Apple over-the-air update for the HomePod (Unknown Model), released on 2018-05-29T17:08:04Z. The update package is 183.09 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e4f6102c8191f9d960b3383ea64f36c42de3d427.zip.