Bricked nRF52840-DK board

[Denis Pynkin]

Hi, looks like I brick my nRF52840-DK board.

It have no any green lights anymore and even do not detected as USB device. The second device I have works well in the same environment with the same cables.

What I did:

- I put the board in bootloader mode by pressing SW5 while booting and has been distracted for a few minutes, so forgot about the mode.

- under Linux I mount `/dev/sda` and put there .hex file I've prepared for normal mode.

- discover my mistake (panic a bit) and removed the copied file from the mounted disk

- the device did not unmounted for a while (~10 min), so I switch it off

After the board  is dead and have no any signs of life.

Any suggestions if it is possible to restore the device?

[Kenneth]

I suggest to try press SW5 while booting again to try to re-program the interface MCU, but this time drag and drop the correct firmware file for the interface MCU:
https://www.nordicsemi.com/Products/Development-hardware/nRF52840-DK/Download?lang=en#infotabs

Best regards,
Kenneth

[Denis Pynkin]

Thanks for the suggestion but I've tried that several times before the ticket creation.

As I said above -- the device is not detected as USB device anymore, so there is no SEGGER J-Link interface or block device.

[Kenneth]

Hmm.. getting out of ideas then, what is the version of the board?

Kenneth

[Denis Pynkin]

same here...

Version on the label on the chip: 2.0.2, 2021.41

[Kenneth]

You can double check if the power switch is working, but it seems like the kit is broken.

Kenneth

[Denis Pynkin]

Right, I already check that and voltage.Seems there is no miracle and I really have a brick on hands.