As Firecore has updated Seas0nPass for a tethered jailbreak Apple TV 4.4.3, so by following the guide below you will learn how to jailbreak Apple TV over iOS 4.4.3 with Seas0nPass. Same guide works for Windows and Mac.
Jailbreak Apple TV 4.4.3 Using Seas0nPass
Double click on Seas0nPass application file, it asks to “Enable UI scripting” so do that if you are launching Seas0nPass first time
Shift + click (Windows) or Option + click (Mac) buttons and select “Create IPSW” button and choose the downloaded IPSW 4.4.3 file
Seas0nPass will start creating custom IPSW firmware, so let it finish
Connect Apple TV to computer and follow on screen instructions to put your Apple TV 2G into DFU mode
When your Apple TV 2G will get entered into DFU mode Seas0nPass will open iTunes and Restore will start
Done! You have tethered jailbroken 4.4.3 firmware Apple TV 2G.
Tethered Boot with Seas0nPass
Whenever your Appe TV 2G losses power or need a restart then you have to boot it using Seas0nPass because its a tethered jailbreak.
Just open Seas0nPass, and click “Boot Tethered”
Connect your Apple TV to computer through USB and then connect Power
Hold down “MENU” and “PLAY/PAUSE” buttons for 7 seven seconds
Seas0nPass will do tethered boot and on completion you can safely disconnect USB