audioOS 9.9.15.4.1 (build 19L452) is an official Apple over-the-air update for the HomePod mini, released on 2022-03-31T17:16:11Z. The update package is 1.15 GB. This is a delta (partial) update that requires 14.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5821285e476340e17f7bc6f628929cb736f78da9.zip.