audioOS 9.9.13.2.1 (build 17B90) is an official Apple over-the-air update for the HomePod, released on 2019-10-30T22:12:40Z. 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: 1220c3e5529674c32ef3c9306e2019ac3a787441.zip.