audioOS 9.9.18.4.1 (build 22L261) is an official Apple over-the-air update for the HomePod, released on 2025-04-16T17:28:30Z. The update package is 1.75 GB. This is a delta (partial) update that requires 15.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5b0860251343aef8a633ee3f943f6e79344e19da.zip.