audioOS 9.9.18.4 (build 22L255) is an official Apple over-the-air update for the HomePod mini, released on 2025-03-31T17:29:43Z. The update package is 1.44 GB. This is a delta (partial) update that requires 16.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 81e69d3fc2cdf09bf68bc4a4930f0e9be035d2a6.zip.