Can't make AC868-A6 V1.4Sp work with Arduino IDE

[JL_M_88]

I just acquired an AC868-A6 V1.4 board from Aliexpress.

I downloaded the lastest KCS_KC868_A6_V2.2.20.bin firmware in it

I want to give a try to Arduino IDE.
I found some ''demo programs'' on the site, such as the one below: (by the way the comment ''Blink Led on PIN0 isn't appropriate !!!) 
Selected ESP32Dev Module board type 
I can compile and download the program.
After downloading the program, the ESP32 will keep reseting indefintely ...
getting this message in the serial monitor:

rst:0x8 (TG1WDT_SYS_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
modeIO, clock div:1
load:0x3fff0030,len:4876
ho 0 tail 12 room 4
load:0x40078000,len:16560
load:0x40080400,len:3500
entry 0x400805b4
ets Jul 29 2019 12:21:46

Any idea about what can be wrong there ?

Thanks

JL


/*
 Blink led on PIN0
 by Mischianti Renzo <http://www.mischianti.org>
 https://www.mischianti.org/2019/01/02/pc...asy-usage/
*/
#include "Arduino.h"
#include "PCF8574.h"
// Set i2c address
PCF8574 pcf8574(0x24);
void setup()
{
  Wire.begin(12, 11); // SDA: GPIO12, SCL: GPIO11
  Serial.begin(115200);
//  delay(1000);
  // Set pinMode to OUTPUT
  pcf8574.pinMode(P0, OUTPUT);
  pcf8574.pinMode(P1, OUTPUT);
  pcf8574.pinMode(P2, OUTPUT);
  pcf8574.pinMode(P3, OUTPUT);
  pcf8574.pinMode(P4, OUTPUT);
  pcf8574.pinMode(P5, OUTPUT);
  pcf8574.digitalWrite(P0, HIGH);
  pcf8574.digitalWrite(P1, HIGH);
  pcf8574.digitalWrite(P2, HIGH);
  pcf8574.digitalWrite(P3, HIGH);
  pcf8574.digitalWrite(P4, HIGH);
  pcf8574.digitalWrite(P5, HIGH);
  Serial.print("Init pcf8574...");
  if (pcf8574.begin()){
    Serial.println("OK");
  }else{
    Serial.println("KO");
  }
}
void loop()
{
  delay(300);
  pcf8574.digitalWrite(P0, LOW);
  delay(300);
  pcf8574.digitalWrite(P1, LOW);
  delay(300);
  pcf8574.digitalWrite(P2, LOW);
  delay(300);
  pcf8574.digitalWrite(P3, LOW);
  delay(300);
  pcf8574.digitalWrite(P4, LOW);
  delay(300);
  pcf8574.digitalWrite(P5, HIGH);
  delay(300);
  pcf8574.digitalWrite(P4, HIGH);
  delay(300);
  pcf8574.digitalWrite(P5, LOW)
}