RE: nRF52840DK Bricked

EthanH — Tue, 26 Oct 2021 14:34:34 GMT

Thank Edvin,

It worked for me now when I held the RESET button then switched the power on, I can see the LED5 starts blinking.

Then reprogram the JLINK firmware.

Thanks again for your kindly help.

Regards,

Ethan

RE: nRF52840DK Bricked

Edvin — Tue, 26 Oct 2021 11:47:50 GMT

Hello,

[quote user=""]4. Pressed and held the RESET button - no USB connection or J-Link shown in the Device manager (PC)[/quote]

When you do this, make sure that you use a USB cable connected to J2 (The one on the short side on the DK), and that you power off and power back on the DK using the power switch on the DK while the RESET button is held. When you do this, does LED5 start blinking?

If not, what are the following switches set to on your DK:

- SW9 (nRF power source)
- SW6 (nRF Only/Default)

Make sure they are on VDD, and DEFAULT, respectively.

Did you at any point cut any solder bridges on the DK? Please check that SB40 and SB41 are still shorted.

Let me know if you test this, and it still doesn't work.

Best regards,

Edvin