NRF CONNECT Quick Start Problem

[sines]

Hi there, I have a nrf54l15 pdk and i want to get any uart log with my kit. I tried the quick start hello world code but it wasn't load application core and reset device. The log outputs and error image is like below.

Could you show my mistake step?

Thanks

2025-03-26T05:17:13.076Z INFO Initialising the bundled nrfutil device
2025-03-26T05:17:13.084Z DEBUG Started watching devices
2025-03-26T05:17:15.463Z INFO Using the bundled core version for nrfutil device: 7.13.0
2025-03-26T05:17:16.014Z INFO Using nrfutil-device version: 2.7.5
2025-03-26T05:17:16.014Z INFO Using nrf-device-lib version: 0.17.41
2025-03-26T05:17:16.015Z INFO Using nrfjprog DLL version: 10.24.2
2025-03-26T05:17:16.015Z INFO Using JLink version: JLink_V7.94i
2025-03-26T05:17:16.199Z DEBUG Selected device: nRF54L15 DK
2025-03-26T05:17:16.240Z DEBUG Changed step: Info
2025-03-26T05:17:17.913Z DEBUG Changed step: Rename
2025-03-26T05:17:18.859Z DEBUG Changed step: Program
2025-03-26T05:17:21.943Z ERROR NRFDLException(1): [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1)
2025-03-26T05:18:03.523Z DEBUG Changed step: Rename
2025-03-26T05:18:04.481Z DEBUG Changed step: Program
2025-03-26T05:18:07.417Z ERROR NRFDLException(1): [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1)
2025-03-26T05:18:36.624Z ERROR NRFDLException(1): [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1)
2025-03-26T05:21:56.437Z DEBUG Changed step: Rename
2025-03-26T05:21:57.083Z DEBUG Changed step: Info
2025-03-26T05:21:58.324Z DEBUG Changed step: Rename
2025-03-26T05:21:59.408Z DEBUG Changed step: Program
2025-03-26T05:22:27.344Z ERROR NRFDLException(1): [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1)
2025-03-26T05:22:53.502Z ERROR NRFDLException(1): [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1)
2025-03-26T05:22:56.452Z DEBUG Changed step: Rename
2025-03-26T05:22:57.978Z DEBUG Changed step: Program
2025-03-26T05:23:01.263Z ERROR NRFDLException(1): [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1)

[Susheel Nuguru]

Just tested it on my end and it seems to work ok

Which version of DK are you having? nRF54L15_DKv0.8.2

[Susheel Nuguru]

check the power source if the USB is actually giving the proper voltage to it. Try to connect it to high current drive USB port and see if that helps.

[sines]

Thanks for response,

I have a NRF54L15PDK_v0.8.1 

Quick Start is working now.

But Serial Output don't give anything.

Log is like below

2025-03-27T09:44:32.004Z INFO Initialising the bundled nrfutil device
2025-03-27T09:44:32.012Z DEBUG Started watching devices
2025-03-27T09:44:33.446Z INFO Using the bundled core version for nrfutil device: 7.13.0
2025-03-27T09:44:34.010Z INFO Using nrfutil-device version: 2.7.5
2025-03-27T09:44:34.010Z INFO Using nrf-device-lib version: 0.17.41
2025-03-27T09:44:34.011Z INFO Using nrfjprog DLL version: 10.24.2
2025-03-27T09:44:34.011Z INFO Using JLink version: JLink_V7.94i
2025-03-27T09:44:35.016Z DEBUG Selected device: nRF54L15 DK
2025-03-27T09:44:35.042Z DEBUG Changed step: Info
2025-03-27T09:44:36.372Z DEBUG Changed step: Rename
2025-03-27T09:44:37.123Z DEBUG Changed step: Program
2025-03-27T09:44:45.936Z DEBUG Changed step: Verify
2025-03-27T09:44:48.942Z INFO Opened port with options: {"path":"COM17","baudRate":115200}
2025-03-27T09:44:53.856Z INFO Closed port: COM17
2025-03-27T09:46:21.561Z INFO Opened port with options: {"path":"COM17","baudRate":115200}
2025-03-27T09:46:26.639Z INFO Closed port: COM17
2025-03-27T09:46:50.250Z DEBUG Changed step: Program
2025-03-27T09:46:51.662Z DEBUG Changed step: Verify
2025-03-27T09:46:58.212Z INFO Opened port with options: {"path":"COM17","baudRate":115200}
2025-03-27T09:47:03.199Z INFO Closed port: COM17
2025-03-27T09:49:46.605Z DEBUG Changed step: Program
2025-03-27T09:49:51.205Z DEBUG Changed step: Verify

As I can see there is no problem look like but it doesn't give output

[Susheel Nuguru]

What did you flash to it and what output were you expecting? Were you expecting some serial output? 
I tried hello world and it works fine to give the output to the serial terminal. Can you disconnect the quick start and connect your device COM to the PC serial terminal emulator?