audioOS 12.0 (build 16A366) is an official Apple over-the-air update for the HomePod, released on 2018-09-17T17:11:54Z. The update package is 1.39 GB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1cfc5962f24a36c255069eb1167821ce0b4968dc.zip.