audioOS 9.9.18.4.1 (build 22L261) is an official Apple over-the-air update for the HomePod mini, released on 2025-04-16T17:28:43Z. The update package is 66.65 MB. This is a delta (partial) update that requires 18.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2b4e9f1f11e7eab6708f9b0be28b6f653eeda227.zip.