New day, new jailbreaking tool. This one is Apple TV specific and is used to create a custom Firmware that you can restore to in iTunes. Even providing a tethered boot tool for when power is lost or just needing a reboot. Seas0npass.app is Mac only and simple to use. It will even download the IPSW if you don’t have it saved on your computer.
Seas0npass is open source and more info can be found here.