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More Info: Consider nRF Connect SDK for new designs

nRF52840 potentially missing bootloader?

Currently we are developing a board that requires to functionality of the nRF52840 dongle (pca10059), however for convenience sake we have incorporated.

The problem arises when programming the board. When the reset switch (sw2) is pressed, this board does not enter the bootloader mode, ie there is no red blinking LED. I have a dongle to work off of as reference and this is doing that no problem.

52840 on our board is connected through micro USB and also has an SWD header present. nRF connect is picking up the jLink connection when I connect it to the SWD header and I am able to drop hex files (Softdevice S140) in and program the board that way, once this is done nRF Connect picks up the micro USB port connection as well in a similar way to the dongle when not in bootloader mode.

The problem arises when attempting to program via nRFUtil, the dongle works fine once in bootloader mode however, since our board is unable to enter bootloader mode, we are unable to add the desired program to the device. 

I have attached screenshots of the memory of both of the devices showing the comparison, the red on the dongle screenshot is listed as bootloader which is why I have determined that perhaps this is the problem.

If any other information is required I will provide it no problem, thanks in advance for any assistance, I apologize if this is in the wrong category.

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