Hi Walker, thank you for the helping.
I understand when i have the COM, i can completely erase.
The problem is that when i try to connect the board to PC, the board result not connected, only at the fourth, fifth attempt, the board is shown on device manager like unknow device, i tried to install the GPS camera driver and the SAM-BA v2.12 driver, but always unknow device.
I remenber the cause was a 5 Volt power line connected,not on Vin pin but on 5V Pin, what damage could I have done?