audioOS 9.9.16.4.1 (build 20L498) is an official Apple over-the-air update for the HomePod (2nd generation), released on 2023-04-12T17:25:30Z. The update package is 563.69 MB. This is a delta (partial) update that requires 16.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9d4d76502db46ab3e1279088f8dd685168ca5377.zip.