And copy update.zip file to USB stick and Insert USB stick on USB slot
Follow below steps.

Press white button on bottom housing and put "AC power" on box at same time.

Then you can see "UPdt" on 7 Segment LED. when you get "UPdt" , no need to press "white button" anymore
Please wait till you are getting "boot" on 7 Segment LED
Click to watch
Enjoy with box.