audioOS 9.9.15.1.1 (build 19J582) is an official Apple over-the-air update for the HomePod, released on 2021-11-03T17:10:23Z. The update package is 328.79 MB. This is a delta (partial) update that requires 15.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: caa27cc14df7ecb2af8b1529bd2d4600033681f0.zip.