N3 not responde on USB with MFDeploy

i have deploy a small programm on my N3 with VS2013:
while (true)
{
led_Bianco.Write(true);
Led_Verde.Write(true);
Led_rosso.Write(true);
led.Write(true);
Thread.Sleep(2400);
led_Bianco.Write(false);
Led_Verde.Write(false);
Led_rosso.Write(false);
led.Write(false);
Thread.Sleep(2400);
}

i have restart the N3. the 4 led non bot blink.
After i connect the usb plug and the tool MFDeploy find my N3.

On MFDeploy if i send any command on short time have an answer, but the answer is not complete because the N3 is online olny for 2-3 second, after non responde.

if required "device capabilities " on targhet menu, have an half information.

No debuNot Supported
gger!
Create TS.
Loading start at 8059bac, end 8083e98
Assembly: mscorlib (4.3.1.0)
Assembly: Microsoft.SPOT.Native (4.3.1.0)
Assembly: Microsoft.SPOT.Hardware (4.3.1.0)
Assembly: Microsoft.SPOT.Net (4.3.1.0)
Assembly: Microsoft.SPOT.Net.Security (4.3.1.0)
Assembly: System (4.3.1.0)
Assembly: System.Net.Security (4.3.1.0)
Assembly: Microsoft.SPOT.Hardware.SerialPort (4.3.1.0)
Assembly: Microsoft.SPOT.IO (4.3.1.0)
Assembly: System.IO (4.3.1.0)
Assembly: Microsoft.SPOT.Hardware.PWM (4.3.1.0)
AsNot Supported

With VS2013 is not possible deploy any programm because the my N3 is not reached.
Iteration 0
Opening port \?\USB#VID_22B1&PID_1000#000000000000#{09343630-a794-10ef-334f-82ea332c49f3}\Operations
Attaching debugger engine…
… cannot attach debugger engine!

Help me please.