nRF54L15 DK Build Error: Unknown Device Family (Generic)

[wac_2025_may]

Hi, I'm a beginner and I'm trying to run an LED blinking program.
However, I'm encountering a device-related error.

I've followed tutorials and installed all the necessary tools and SDKs.

But I always get the following error:

FATAL ERROR: command exited with status 1: nrfutil --json device x-execute-batch --batch-path
Device error: Unknown device: Unknown device family (Generic)

Can someone help me understand what this error means and how to fix it?
Thank you.

[wac_2025_may]

[wac_2025_may]

Hi,
Thank you for your feedback.
I am strictly following the Academy course for my evaluation.
I couldn't flash FW despite multiple attempts.

I followed [v2.90-v2.70] from academy:

1. Install nRF Command Line Tools. -->nrf-command-line-tools-10.24.2-x64.exe
2. Installl SEGGER J-Link v8.10f -->JLink_Windows_V810f_x86_64.exe
3. Install nrfutil and the nrfutil device command --> nrfutil.exe (64 bit version)
- performed nrfutil self-upgrade and nrfutil install device, updated Environment variable C:\nordic_tools
4. Install VS Code --> VSCodeUserSetup-x64-1.100.0.exe
5. Install nRF Connect Extension Pack --> all requested packs
-nRF Connect for VS Code, nRF DeviceTree, nRF Kconfig, nRF Terminal, C/C++ from Microsoft, GNU Linker Map Files, CMake

6. Install Toolchain -->v2.9.2
7. Install nRF Connect SDK -->v2.9.2

Below is board reference:

[wac_2025_may]

Menon said:

Abhijith

Hi,

I was able to flash the firmware properly after switching from the nRF54L15-PDK to the nRF54L15-DK.
I plan to continue using the nRF54L15-DK from now on..

It seems that my nRF54L15-PDK might have been write-protected or had some other issue.

Just in case, I’ll share a screenshot of the problematic screen I encountered with the PDK.

FYI: I was unable to post all of my questions in a single reply due to some restrictions on the Nordic DevZone, so I had to split them into multiple Reply posts (above/below).

[Menon]

Hello,

I went through the replies you shared and thanks for providing the details. I'm still not sure about the build configuration you're using. Are you building the application for the PDK or the DK?

The AP protection should be removed by clicking "YES" in the pop-up, but I'm not sure why that's not working for you. Try using the nrfutil device recover command to remove AP protection, see recovering device section .
I've seen a similar error message before, and it was resolved after updating nRF Util to the latest version. Can you try the nrfutil upgrade device command and see if that resolves the issue? Here's another old ticket of mine for reference.

If the issue persists, I recommend collecting logs as mentioned in my first comment to get more details.

Kind Regards,

Abhijith