Nano works perfectly but impossible to repeat it with Mega 2560

Hi,

I bought PRO version and I'm trying to make it works with my MEGA 2560 Mini.

My setup:
- 2pcs Bluetooth modules (HM10 clown)
- Arduino Nano (LED D13)
- Arduino Mega 2560 Mini (LED D13)
- RemoteXY PRO + latest lib + Arduino IDE
- Android Samsung phone
- Basic "Blink" BT HardSerial test program applied for testing

A very strange thing is happening:
- D13 LED flashes as expected with both HM10 applied to Nano.
- BT connected but "Device not reply. Receive time out error" with both HM10 applied to Mega 2560 Mini !?!!
- RemoteXY editor: right MCU "Mega 2560" selected in config + HardSerial Rx0/Tx1.
- BLE paired & Mega 2560 HardSerial is running well with any Hyperterminal over BT.

Any idea?

Thank :-)

/*
   -- Mega_2560_test --
   
   This source code of graphical user interface 
   has been generated automatically by RemoteXY editor.
   To compile this code using RemoteXY library 2.3.5 or later version 
   download by link http://remotexy.com/en/library/
   To connect using RemoteXY mobile app by link http://remotexy.com/en/download/                   
     - for ANDROID 4.3.1 or later version;
     - for iOS 1.3.5 or later version;
     
   This source code is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.     
*/

//////////////////////////////////////////////
//        RemoteXY include library          //
//////////////////////////////////////////////

// RemoteXY select connection mode and include library 
#define REMOTEXY_MODE__HARDSERIAL

#include <RemoteXY.h>

// RemoteXY connection settings 
#define REMOTEXY_SERIAL Serial
#define REMOTEXY_SERIAL_SPEED 38400

// RemoteXY configurate   
#pragma pack(push, 1)
uint8_t RemoteXY_CONF[] =
  { 255,1,0,0,0,13,0,8,13,0,
  1,0,23,17,12,12,2,31,88,0 };
   
// this structure defines all the variables of your control interface 
struct {

    // input variable
  uint8_t button_1; // =1 if button pressed, else =0

    // other variable
  uint8_t connect_flag;  // =1 if wire connected, else =0

} RemoteXY;
#pragma pack(pop)

/////////////////////////////////////////////
//           END RemoteXY include          //
/////////////////////////////////////////////

#define PIN_BUTTON_1 13

void setup() 
{
  RemoteXY_Init (); 
   
  pinMode (PIN_BUTTON_1, OUTPUT);
   
  // TODO you setup code
   
}

void loop() 
{ 
  RemoteXY_Handler ();
   
  digitalWrite(PIN_BUTTON_1, (RemoteXY.button_1==0)?LOW:HIGH);
   
  // TODO you loop code
  // use the RemoteXY structure for data transfer

}