audioOS 9.9.18.4 (build 22L255) is an official Apple over-the-air update for the HomePod mini, released on 2025-03-31T17:29:44Z. The update package is 1012.01 MB. This is a delta (partial) update that requires 18.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 54b59944104dd1622823bb14800e2c80747dccc6.zip.