audioOS 9.9.12.1.1 (build 16C50) is an official Apple over-the-air update for the HomePod, released on 2018-12-05T18:07:03Z. The update package is 149.36 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 89b6a8262a838f034119e115bffab1a71f441cad.zip.