audioOS 9.9.13.3.1 (build 17D50) is an official Apple over-the-air update for the HomePod (Unknown Model), released on 2020-01-28T18:34:14Z. The update package is 1.67 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: 3133b10d30cc6ddeedcd0bb397ab096988225a42.zip.