Arduino DUE - Can not upload

I have 2 new boards of Arduino DUE and I can not upload them.
The ARM P.N. is: ATSAM3X8E
I made copy and paste into the ardoino window the Blink led example,
Selected the com8 and clicked the upload.
The results:
avrdude: stk500_getsync(): not in sync: resp=0x00
Did I chose the right board (Arduino Duemilanov w/ATmega328)?
I had also try to change to com1 and got the same results.
(See the window snapshot attached)

Please… your advice…

You need to download 1.5.2 from the Arduino downloads page. Then select DUE from the boards menu.

1.0.5 does not support the DUE. Duemilanove is not the same as DUE.

Many thanks! It's working!! Ronen