Can't find HC-05 communications speed (findBaud) - bluetooth

Question

I am trying out Arduino Uno + HC-05 using this library. I don't think it is working properly. This is the Serial Monitor's output of the example "echo":
findBaud
Trying 4800... x
Trying 9600... x
Trying 19200... x
Trying 38400... x
Trying 57600... x
Trying 115200... x
No connection
No Connection, waiting...OK
None of the Communication speed works, but I manage to connect my Android phone (w/ Bluetooth Terminal) to the HC-05, which is why you see "OK" at the end of the output. But it is not able to echo my input from the Bluetooth Terminal.
The Arduino code:
#include <Arduino.h>
#include "HC05.h"
#include <SoftwareSerial.h>
HC05 btSerial = HC05(A2, A5, A3, A4); // cmd, state, rx, tx
void setup()
{
DEBUG_BEGIN(57600);
btSerial.findBaud();
}
void loop()
{
btSerial.println("Echo Server- type something");
while (btSerial.connected())
{
if (btSerial.available())
{
btSerial.write(btSerial.read());
}
}
}
How I connect the HC-05 to Arduino:
I just follow the instruction(5V and GND; State, Rx and Tx to A5, A3 and A4 respectively) , except I don't have pin "cmd", but I do have pin "CFG", so I just assume that should be cmd and connect it to A2

Answer 1

(I know I should comment instead of writting an answer, but I need 50 reputation)
Same here.
I tried with and without the lib and with different pins. I also tried an arduino micro and uno.
Always the same: the module's LED blink (when I send data trough RX/TX it seems) but I can't have any answer (neither when switching to command mode with "$$$" and neither with AT commands with KEY pin - on my module it is named EN, maybe for enable, I assume it is the same)
EDIT:
I should have RTFM. Especially this.
Here are my findings :
The bluetooth module is called HC-05 and the whole board I have is ZS-040.
The EN pin is used to switch off the module, if set to LOW
The small button switch can be pushed to enter command mode (I don't have a KEY pin)
Speed is 9600 bauds by default and stay the same when entering command mode
To debug your connection you can use the Android app called BlueSerial
For the record, here is my code :
#include <SoftwareSerial.h>
#define HC05_STATE 5
#define HC05_RXD_ARDUINO_TXD 4
#define HC05_TXD_ARDUINO_RXD 3
#define HC05_EN 2
SoftwareSerial BTSerial(HC05_TXD_ARDUINO_RXD, HC05_RXD_ARDUINO_TXD); // RX | TX
void setup(void)
{
pinMode(HC05_EN, OUTPUT);
digitalWrite(HC05_EN, HIGH); // just to be sure to enable the module, if not plugged it still works
Serial.begin(9600);
BTSerial.begin(9600); // default speed
Serial.println("Ready");
}
void loop(void)
{
if (BTSerial.available())
{
Serial.print("< ");
while (BTSerial.available())
Serial.write(BTSerial.read());
Serial.print("\n");
}
if (Serial.available())
{
Serial.print("> ");
while (Serial.available())
{
char c = Serial.read();
BTSerial.write(c);
Serial.write(c);
}
Serial.print("\n");
}
}