Folks at FireCore has released an update for their Seas0nPass jailbreak tool which includes support for untethered jailbreak for Apple TV 4.4.4.
To do Apple TV 2G 4.4.4 untethered jailbreak with Seas0nPass just follow the guide written below.
Untethered Jailbreak Apple TV 4.4.4 with Seas0nPass
Double click Seas0nPass application, it asks to “Enable UI scripting” so do that if you are launching Seas0nPass first time
Use Shift + click (Windows) or Option + click (Mac) buttons, click “Create IPSW” button and choose the downloaded iOS 4.4.4
Seas0nPass starts creating custom IPSW firmware, so let it do that
Connect your Apple TV to computer and follow on screen instructions to put your Apple TV 2G into DFU mode
When your device will get entered into DFU mode, iTunes pop-up and starts Restore
Done! Your iDevice is running over untethered iOS 4.4.4