audioOS 9.9.16.3.1 (build 20K661) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2023-02-06T18:20:09Z. The update package is 56.02 MB. This is a delta (partial) update that requires 16.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 657de16977c02d95c70652003a25162b4e15bf59.zip.