xFi Gateway struck at booting

Hi folks,

I am a new user to Xfinity. While I am setting up the new gateway, it does not boot up properly. 

It stuck at the green and orange blinking light for 5 hours. 

 

Did any of you guys encounter the same issues? How could I resolve this? 

 

Gateway model:  xFi Advanced Gateway (XB6)

 

Thank you!