I'm trying to flash code in nRF52840 DK through Arduino IDE, but it kept failing.
I could only burn the bootloader with Arduino IDE.


Setting of board here:

Can anyone help me with this? Am I missing something in the setting to flash code to nRF52840 DK using Arduino IDE?
I can do it successfully with nRF52 Programmer, using the HEX file but the code has no effect on the nRF52DK. The below-mentioned Blink Code:
/*
Blink
Turns on an LED on for one second, then off for one second, repeatedly.
Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN takes care
of use the correct LED pin whatever is the board used.
If you want to know what pin the on-board LED is conn
ected to on your Arduino model, check
the Technical Specs of your board at https://www.arduino.cc/en/Main/Products
This example code is in the public domain.
modified 8 May 2014
by Scott Fitzgerald
modified 2 Sep 2016
by Arturo Guadalupi
*/
#include <Arduino.h>
#include <Adafruit_TinyUSB.h> // for Serial
#define LED_BUILTIN PIN_LED2
// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalToggle(LED_BUILTIN); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
}
How to access nRF52840DK pins in Arduino IDE, direct pin number doesn't work clearly?