please help me i’m new user this box

hi i’am a new user for Avatar Box i want to know activate it before was i activate my friend dont use it he send for me now but its a long time sent this box for me i want to know or i can use and buy activation if Possible maximum info about this tools i see buy a resseller Vietnamese the name its saigonmobile.
I dont see the serial number on the box i see on back cover 2 inscritptions
AVATAR BOX AND ACTIVATION ITS VCDHPBEU I want to know how i can detect my serial Number.. thank you