audioOS 9.9.18.4

audioOS 9.9.18.4 (build 22L255) is an official Apple over-the-air update for the HomePod, released on 2025-03-31T17:29:28Z. The update package is 1.99 GB. This is a delta (partial) update that requires 13.4.6 to already be installed on the device - it cannot be applied from scratch. This update is no longer signed by Apple, meaning it can no longer be downloaded and applied on-device through Settings.

The OTA payload file is 237c6b52b3c13cda902dadc0cc6de60e4ab1b0ef.zip.