Put Apple TV in DFU Mode

To place the Apple TV 4 (Apple TV HD) into DFU, follow these steps. 
 
 
 Make sure the device is connected to power and is turned on. 
 
 
 Connect the device to the computer using a USB-C cable. 
 
 
 Press and hold the Menu and Play buttons until the LED starts flashing rapidly (6 seconds) 
 
 
 Release both buttons. 
 
 
 
 To place the Apple TV 4K into DFU, use the following steps. 
 
 
 Disconnect the device from the power source. 
 
 
 Connect the DCSD cable to the computer's USB port. 
 
 
 Connect the GoldenEye adapter to the DCSD cable (using Lightning) 
 
 
 Connect the GoldenEye to the Apple TV 4K. 
 
 
 Connect the Apple TV 4K to the power source.