audioOS 9.9.18.4 (build 22L255) is an official Apple over-the-air update for the HomePod, released on 2025-03-31T17:29:29Z. The update package is 1.97 GB. This is a delta (partial) update that requires 14.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 015b578de0fc0d2a987ae6e5618572ddba8a2528.zip.