audioOS 9.9.16.4 (build 20L497) is an official Apple over-the-air update for the HomePod mini, released on 2023-03-27T17:13:29Z. The update package is 563.02 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: 61cf2f84ba82c646a576360a50b54c1b48fb3a18.zip.