installation - Arduino Due: not sync to MAC/ PC -

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situation:

arduino due encounter sync issue, following setting: board & port selection

however show these: shows error
, arduino board tx blinking.

what tried doesn't work:

1) on both mac (yosemite 10.10.3) , win7 (home premium), both show same error
2) try solutions suggested online, remove connection on pin0, don't have connection on pin0
3) press connect usb & press reset button on arduino board


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