audioOS 9.9.13.4 (build 17L256) is an official Apple over-the-air update for the HomePod (Unknown Model), released on 2020-03-24T17:16:04Z. The update package is 1.52 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 05cffa4a4d6f440c8a8176dc61ab9ed6dafc2335.zip.