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  • Case ID: 346625
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DK91 debugger and USB debugger detection issue, windows 11

phil38

I am experiencing an issue with my nRF915DK board. When I connect the board to my PC via USB, the debugger LED blinks continuously.

I have the same issue with a nrf52840DK.

I'm using a JLink_V7.94i driver.

I had try to use different USB cable

  • 0

    Note, the serial number (i.e 1051288714)  is displayed in vs code 

    Thanks in advance , Philippe

  • 0 in reply to phil38

    Hi,

    Are those boards both new?

    Have you flashed any sample on them previously?

    Could you try setting the device in Bootloader mode?

    Regards,

    Priyanka

  • 0 in reply to Priyanka

    These have been already used, and flash with some sample.

    Here is the log I had when I open the DK9151 with tthe Nrf Programmer

    2025-06-06T11:59:02.492Z INFO Using the bundled core version for nrfutil device: 8.0.0
    2025-06-06T11:59:03.166Z INFO Using nrfutil-device version: 2.6.4
    2025-06-06T11:59:03.166Z INFO Using nrf-device-lib version: 0.17.35
    2025-06-06T11:59:03.166Z INFO Using nrfjprog DLL version: 10.24.2
    2025-06-06T11:59:03.166Z INFO Using JLink version: JLink_V7.94i
    2025-06-06T11:59:03.542Z INFO Getting serial port options from the persistent store for 001051288714.pc-nrfconnect-programmer
    2025-06-06T11:59:03.543Z INFO Getting serial port options from the persistent store for FTC9QOG6.pc-nrfconnect-programmer
    2025-06-06T11:59:06.182Z INFO Selecting device with the serial number 001051288714
    2025-06-06T11:59:07.799Z INFO Selected device with the serial number 001051288714
    2025-06-06T11:59:07.799Z INFO Using nrfutil device to communicate with target via JLink
    2025-06-06T11:59:09.298Z INFO Reading readback protection status for Application core
    2025-06-06T11:59:09.299Z ERROR Failed "reading readback protection status for application core". Error: code: 1, description: Generic, message: Batch task protection-get failed, [Probe] Emulator error: No emulator with connection info 'Usb(JLinkSerialNumber(1051288714))' was found
    2025-06-06T11:59:09.619Z ERROR Error: Failed with exit code 1.
    One or more batch tasks failed:
    - [Probe] Emulator error: No emulator with connection info 'Usb(JLinkSerialNumber(1051288714))' was found, code: Generic.
    Message: Batch task protection-get failed, [Probe] Emulator error: No emulator with connection info 'Usb(JLinkSerialNumber(1051288714))' was found.
    2025-06-06T11:59:18.113Z INFO Getting serial port options from the persistent store for 001051288714.pc-nrfconnect-programmer

  • 0

    The issue has been resolved by removing  all Windows registry entries related to a specific USB device (by serial number), using the following method:

     

    1. Download and run USBDeview (free, portable tool).
    2. Find your device in the list (look for your serial number: 001051288714).
    3. Right-click the entry and select "Uninstall Selected Devices".
    4. Unplug and replug your DK.

    Regards, Philippe

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