audioOS 9.9.16.3.1 (build 20K661) is an official Apple over-the-air update for the HomePod mini, released on 2023-02-06T18:20:08Z. The update package is 1.15 GB. This is a delta (partial) update that requires 15.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c33380299141686f7448813fa4ad510bd893ff65.zip.