tvOS 6.1.4 (build 10B809) is an official Apple over-the-air update for the Apple TV 2G. The update package is 550.79 MB. This is a delta (partial) update that requires null already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: d6f1398fc75b59baa525ab0d85997ecdcf41688d.zip.