audioOS 12.1 (build 16B92) is an official Apple over-the-air update for the HomePod, released on 2018-10-30T17:16:20Z. The update package is 135.85 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c12b4f0daace793cf0b48bc92fdcb92fb92be8e6.zip.