audioOS 9.9.15.6 (build 19M65) is an official Apple over-the-air update for the HomePod, released on 2022-07-20T17:23:47Z. The update package is 516.25 MB. This is a delta (partial) update that requires 15.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c05cad4312f6aacd8d18ea2ccd67f6e9e9244c8e.zip.