DK nrf52840 fail nrfconnect

[Limberth Uc]

When i phisicaly connect by micro-

Fullscreen 2025-03-11T06_04_18.575Z-log.txt Download

2025-03-11T06:04:18.814Z INFO Initialising the bundled nrfutil device
2025-03-11T06:04:18.822Z DEBUG Started watching devices
2025-03-11T06:04:20.298Z INFO Using the bundled core version for nrfutil device: 7.13.0
2025-03-11T06:04:20.726Z INFO Using nrfutil-device version: 2.7.5
2025-03-11T06:04:20.726Z INFO Using nrf-device-lib version: 0.17.41
2025-03-11T06:04:20.727Z INFO Using nrfjprog DLL version: 10.24.2
2025-03-11T06:04:20.727Z INFO Using JLink version: JLink_V7.94i
2025-03-11T06:04:21.835Z DEBUG Selected device: nRF52840 DK
2025-03-11T06:04:21.855Z DEBUG Changed step: Info
2025-03-11T06:04:31.241Z DEBUG Changed step: Rename
2025-03-11T06:04:39.502Z DEBUG Changed step: Program
2025-03-11T06:05:07.798Z ERROR  NRFDLException(1): [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1)
2025-03-11T06:05:19.670Z ERROR  NRFDLException(1): [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1)

usb to my PC, nrfConnect does not flashing DK

[Einar Thorsrud]

Hi,

It seems the deubber is not able to comunicate with the target nRF. Are you using the onlboard debugger to debug the nRF on the DK, or an external board? Can you share a photo of  your setup (I wonder if there are any connections, and the state of the switched on the DK). (Here is another thread about a similar issue).

[Limberth Uc]

I'm installed j-link v7.94i to debug the board, that's the version that required nrfConnect. 

[Einar Thorsrud]

Hi,

All switches etc ook correct on the board, but just to be sure and in case fo bad connection, can you make sure the nRF power source switch is at VDD, and that the switch in the upper right end is at posstition "DEFAULT"?

Also, can you test other methods of programming the device, like nrfutil device or nRF Connect Programmer? Does that work? If not, can you share the log?