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 23.84 MB. This is a delta (partial) update that requires 13.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f7ba8bbde78349b341f2956dd6db8dbbf881137d.zip.