Bluetooth module working with original arduino but not with clone

[ndrei]

This the code:

#include <SoftwareSerial.h>

SoftwareSerial BTserial(2, 3); //RX|TX

char c=' ';

void setup()
{
Serial.begin(9600);
BTserial.begin(38400);
}

void loop()
{

c = BTserial.read();
Serial.write(c);

}

[system]

(deleted)