Bricked nRF52840-DK

[jimmii]

Hello, I have following problem.

My DK is not recognized by J-Link / nRFgo Studio.

I tried to reflash J-Link by pressing BOOT/RESET and then drag and drop J-Link OB-SAM3U128-V2-NordicSemi 170724.bin to the BOOTLOADER Drive. LED5 is then flashing fast.

But even after a power cycle, the device is still not recognized. What can I do? Do you have any tips?

Thanks for your help.

Jimmii

[AndreasF]

Hi Jimmii.

Please try/confirm the following:

1. Does the device show up in Device Manager on your computer? Please try to connect and disconnect the kit a few times. It might show up with unexpected names.
2. Have you tried a different USB cable? Faulty cables are surprisingly often the problem.
3. Have you tried using a different computer? If it works on a different computer we know that the kit is not broken and that it is probably a driver issue.
4. Have you measured the supply voltage on the kit? It should be somewhere between 2.8V-3.3V. If it isn't, then the hardware is probably broken.
5. Have you made sure that you are using the latest J-Link driver version?
6. Have you tried this guide?

Best regards,

Andreas

[jimmii]

Hi Andreas

Thanks for your help. I managed to get it working by using another pc. So I think this is was a driver issue.

Thanks again.

Roman