Need to create Bootloader for the nRF52840 DK.

[PSNSK]

Hi ,

I need to do create the bootloader . generally what we dump in to the board was the firmware not bootloader right.
I want to do the OTA updates on the nRF52840 Dev kit. So I want to dump the bootloader. 
I am using the nrf connect extension for vs code and run & dumps the code .
I also try in nrf connect Desktop vesion. But in programmer app ENABLE MCUboot was disabled. Not able to enable.
I dont know what to do.
If any one worked please help me out or else share the tutorials.
I want my OTA updates should be done by the bootloader by the slot 0 and slot 1 for the new firmware.
if new firmware fails it revert back to the old firmware .like that I want to develop.

Please help me out

[AHaug]

Hi,

I see that you're relative new here on DevZone, so here's some resources to get you started with your DFU implementation.

On our Academy pages we have the following courses I would recommend you to have a look at

1. https://academy.nordicsemi.com/courses/nrf-connect-sdk-fundamentals/ for fundamentals on nRF Connect SDK. Not all lessons are relevant, but it's great to go through it to lower the learning curve anyways
2. https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/ intermediate course which has it's own topic for DFU and OTA: https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/ 
3. https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/ for BLE fundamentals

In addition, I would like to highlight this page on our documentation page: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf52/index.html 

Kind regards,
Andreas