audioOS 9.9.18.4 (build 22L255) is an official Apple over-the-air update for the HomePod mini, released on 2025-03-31T17:29:41Z. The update package is 1.76 GB. This is a delta (partial) update that requires 15.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8f32d89b3f0536b9125d657a706a26450cc5b668.zip.