Followed the necessary to talk to SAM3X8E through the shared serial port using microUSB port CN6, provided as guidelines in udoo manual on page 17, but getting following error. avrdude: Version 5.11, compiled on Sep 2 2011 at 19:38:36 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2009 Joerg Wunsch System wide configuration file is "C:\Users\Office\Desktop\arduino ide/hardware/tools/avr/etc/avrdude.conf" Using Port : COM16 Using Programmer : arduino Overriding Baud Rate : 115200 avrdude: Send: 0 [30] [20] avrdude: Send: 0 [30] [20] avrdude: Send: 0 [30] [20] avrdude: Recv: avrdude: stk500_getsync(): not in sync: resp=0x00 avrdude done. Thank you soln?????