audioOS 9.9.18.4.1 (build 22L261) is an official Apple over-the-air update for the HomePod, released on 2025-04-16T17:28:34Z. The update package is 1.43 GB. This is a delta (partial) update that requires 16.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: de3da34e1d4bb507a52f2c21a93bd71c89e7ab5f.zip.