how can I burn adafruit nRF52 Bootloader to nRF52832 chip

Question

Hi 
 I have the Adafruit Feather nRF52 Bluefruit - nRF52832 board that I can program it using Arduino via Adafruit library in Arduino without any problems. 
 Now I have an external nRF52832 chip and I have nRF52 DK too. I tried to program the external nRF52832 using the Adafruit library in Arduino but seems like it won't work until I burn the adafruit Bootloader to the external nRF52832 first (excuse me for not figuring this out from the beginning cause I'm a beginner in this field). 
 
 So, the question now is how can I burn the adafruit bootloader to my external nRF52832 so that I can program it using Adafruit Arduino library? 
 
 Thanks in advance!

BinderT · Accepted Answer

Working under assumptions. The output hex is getting signed by nrfutil before flashing the chip. If you can find where the hex file is stored before getting signed you can directly flash the external nRF52832 with your application. File > preferences. Settings tab > verborse output during. Tick compilation and upload will help you see where files are going on your system. Not aware of any support for using J-links with the IDE. You can also try using the DK to flash the bootloader from here .

BinderT · Answer

No need to compile the bootloader. There is a section on the git that shows how to burn bootloaders . Just make sure you are not flashing the chip on the DK. Have a look at this . VTG need to be equal to VDD to tell the DK it is flashing an external chip. Don't see a exposed SW interface on your schematic witch will make it impossible to burn a bootloader on a clean chip.

BinderT · Answer

Hussein said: I'm sorry, but I don't understand what you mean?! 
 Was referring to the pins SWDIO and SWCLK used to program the chip. Clearly not the case since you get the chip programmed. 
 Hussein said: I received this error again!! 
 Since you can flash the chip once it tells me that it is the last point in the error log is the cause: "target is not in DFU mode" dfu/p0.20, are you pulling this pin low and pulling the resetting low before flashing from Arduino? This will activte the DFU mode. hold dfu/p0.20 low > press reset > release dfu/p0.20 Assuming these pins are connected to buttons.

how can I burn adafruit nRF52 Bootloader to nRF52832 chip

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