tvOS 12.1 (build 16J5600a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-10-15T17:13:36Z. The update package is 138.51 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: e1eb9695c36c6bcb4eac8f4976467688735eb0eb.zip.