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.

[summersun]

Hi, same problem with v8.42 as below.

2025-09-01T09:33:12.215Z INFO Initialising the bundled nrfutil device
2025-09-01T09:33:12.216Z DEBUG Started watching devices
2025-09-01T09:33:13.202Z INFO Using the bundled core version for nrfutil device: 8.1.1
2025-09-01T09:33:13.308Z INFO Using nrfutil-device version: 2.10.2
2025-09-01T09:33:13.308Z INFO Using nrf-device-lib version: 0.17.71
2025-09-01T09:33:13.308Z INFO Using nrf-probe version: 0.38.0
2025-09-01T09:33:13.308Z INFO Using JLink version: JLink_V8.42
2025-09-01T09:33:13.309Z INFO Your version of SEGGER J-Link (8.42) is newer than the one this app was tested with (8.18). The tested version is not required, and your J-Link version will most likely work fine. If you get issues related to J-Link with your devices, use the tested version.
2025-09-01T09:33:13.322Z WARN It looks like you have installed JLink using 64-bit Apple M1 Installer, but currently we only support their Universal Installer for your system.
2025-09-01T09:33:13.322Z WARN Please install JLink: www.segger.com/.../JLink_MacOSX_V818_universal.pkg
2025-09-01T09:33:15.220Z DEBUG Selected device: nRF54L15 DK
2025-09-01T09:33:15.242Z DEBUG Changed step: Info
2025-09-01T09:33:16.612Z DEBUG Changed step: Rename
2025-09-01T09:33:17.311Z DEBUG Changed step: Program
2025-09-01T09:33:29.614Z ERROR [ProbeLib] [2025-09-01 09:33:29.614017Z] Failed to initialize worker: Timed out waiting for response from worker.
2025-09-01T09:33:33.844Z ERROR [ProbeLib] [2025-09-01 09:33:33.844268Z] Trace channel disconnected unexpectedly.
2025-09-01T09:33:33.848Z ERROR [ProbeLib] [2025-09-01 09:33:33.848076Z] Worker terminated by signal 9.
2025-09-01T09:33:33.848Z ERROR [ProbeLib] [2025-09-01 09:33:33.848122Z] Error output of terminated worker:

error with https://www.segger.com/downloads/jlink/JLink_MacOSX_V818_universal.pkg

2025-09-01T09:30:42.524Z INFO Initialising the bundled nrfutil device
2025-09-01T09:30:42.526Z DEBUG Started watching devices
2025-09-01T09:30:43.572Z INFO Using the bundled core version for nrfutil device: 8.1.1
2025-09-01T09:30:43.678Z INFO Using nrfutil-device version: 2.10.2
2025-09-01T09:30:43.679Z INFO Using nrf-device-lib version: 0.17.71
2025-09-01T09:30:43.679Z INFO Using nrf-probe version: 0.38.0
2025-09-01T09:30:43.679Z INFO Using JLink version: JLink_V8.18
2025-09-01T09:30:45.530Z DEBUG Selected device: nRF54L15 DK
2025-09-01T09:30:45.551Z DEBUG Changed step: Info
2025-09-01T09:30:49.395Z DEBUG Changed step: Rename
2025-09-01T09:30:50.478Z DEBUG Changed step: Program
2025-09-01T09:31:03.555Z ERROR [ProbeLib] [2025-09-01 09:31:03.553444Z] Failed to initialize worker: Timed out waiting for response from worker.
2025-09-01T09:31:07.773Z ERROR [ProbeLib] [2025-09-01 09:31:07.772947Z] Trace channel disconnected unexpectedly.
2025-09-01T09:31:07.776Z ERROR [ProbeLib] [2025-09-01 09:31:07.776647Z] Worker terminated by signal 9.
2025-09-01T09:31:07.777Z ERROR [ProbeLib] [2025-09-01 09:31:07.776681Z] Error output of terminated worker:

Tried with another nRF DK, ok to flash.