Please note that the jailbreak just works on tvOS 9.0-9.0.1, so if you've already updated you won't be able to jailbreak your device.
Currently, the jailbreak only provides SSH access to the Apple TV for developers. However, it likely won't be long before we see some packages and perhaps an installer for tweaks.
You can download the jailbreak from here. We'll be posting instructions on how to jailbreak your device shortly.
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