My nRF52840 Preview DK Board doesn't work

[johnmartin117]

Not sure what I did to cause this, but my nRF52840 no longer works. I searched for solutions and came across:

https://devzone.nordicsemi.com/f/nordic-q-a/24592/my-nrf52-nrf51-dk-kit-doesn-t-work

In step 4, I press and hold the BOOT/RESET button then power up the board. It does power up and LED5 starts to blink. On my Mac I can see a drive with a single file named

"bootload.htm". So I try to get the linked JLINK file from the answer, but the link no longer works. Can you point me to the file?

Thanks,

John

[wpaul]

Try this link instead:

https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK/Download#infotabs

The "Interface MCU Firmware" image is the first file.

[johnmartin117]

That worked great!

I copied the J-Link firmware image file to the BOOTLOADER drive on my Mac, waited 30 seconds, restarted the nRF52840 board and I was able to connect j-link once again.

Thank you!