audioOS 9.9.15.4.1 (build 19L452) is an official Apple over-the-air update for the HomePod mini, released on 2022-03-31T17:16:13Z. The update package is 478.82 MB. This is a delta (partial) update that requires 15.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f2fd15647be5d5e6816324bb89061dfedff24b11.zip.