Not able to flash nRF54

[summersun]

Hi,

I'm not able to flash nRF54 DK. Log as below:

2025-08-29T06:47:39.828Z INFO Initialising the bundled nrfutil device
2025-08-29T06:47:39.874Z DEBUG Started watching devices
2025-08-29T06:47:42.718Z INFO Using the bundled core version for nrfutil device: 8.1.1
2025-08-29T06:47:42.846Z INFO Using nrfutil-device version: 2.10.2
2025-08-29T06:47:42.847Z INFO Using nrf-device-lib version: 0.17.71
2025-08-29T06:47:42.847Z INFO Using nrf-probe version: 0.38.0
2025-08-29T06:47:42.847Z INFO Using JLink version: JLink_V8.18
2025-08-29T06:47:42.923Z DEBUG Selected device: nRF54L15 DK
2025-08-29T06:47:42.957Z DEBUG Changed step: Info
2025-08-29T06:47:44.231Z DEBUG Changed step: Rename
2025-08-29T06:47:45.203Z DEBUG Changed step: Program
2025-08-29T06:47:59.434Z ERROR [ProbeLib] [2025-08-29 06:47:59.434017Z] Failed to initialize worker: Timed out waiting for response from worker.
2025-08-29T06:48:03.636Z ERROR [ProbeLib] [2025-08-29 06:48:03.637323Z] Trace channel disconnected unexpectedly.
2025-08-29T06:48:03.645Z ERROR [ProbeLib] [2025-08-29 06:48:03.646395Z] Worker exited with error code 1.

[Kazi Afroza Sultana]

Hello,

You can try to recover the DK by nrfutil device recover command and see if the error persists. 

[BloPoPs]

I had the same problem after launching a project in debug mode, a timeout occured and then unable to flash/recover/reset the board throug the VS Code interface (panel "NRF CONNECT:CONNECTED DEVICES"). I fix it by installing JLink v8.60 and launching "J-Link.exe" on a new terminal (outside VS Code). A pop up appeared saying it will recover the board, clicked OK. It is now working with VS Code and debug mode.