Unknown device error 9 in nrf programmer

[Khodidas11]

Hi,

We designed our custom board using nrf54l05, and tried to flash it using segger J-lInk as well as using nrf54L15-DK Debuger out port using nrf connect Programmer utility. we checked and verified connections which are OK, 
but facing issue of error code 9, UNKNOWN Device.

Please Help

Regards

Khodidas

[Jared]

Hi,

Can you try to use nRF Command line Tools and do a recover? If it fails, can you add the --log argument and share the log with us?

Make sure that the device is powered when doing this.

nrfjprog --recover --log

best regards

Jared

[Khodidas11]

Already tried this , error throws. It was using nrf54l15-Dk external debugger output port

[Jared]

Hi,

Instead of using nRF connect programmer, can you try to use nrfutil device from the command line and do a recover:

nrfutil device recover

Can you share a screenshot of what it returns?

regards

Jared

[Khodidas11]

Hi,

We tried response is as attached

 

[Jared]

Hi,

Can you update nrfutil as well, you are using an older version,

run:

nrfutil self-upgrade

best regards

Jared

[Jared]

Hi,

If it still doesn't work after upgrading nrfutil and nrfutil device to the latest versions, please run:

nrfutil device recover --log-output stdout --json

This will give you a more verbose log, please upload this log and I'll discuss it with our developers,

best regards

Jared 

[Khodidas11]

Hi,

check log, tried using nrfutill
 

Fullscreen NRF54L05_error.txt Download

C:\>nrfutil device recover --log-output=stdout --json
{"type":"log","data":{"level":"INFO","message":"nrfutil-device (version = 2.10.2, platform = x86_64-pc-windows-msvc, classification = nrf-external) invoked with recover --log-output=stdout --json ","timestamp":"2025-05-13T06:47:50.349Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.500997Z] Opened J-Link DLL at C:\\Program Files\\SEGGER\\JLink_V818\\JLink_x64.dll with version 8.18","timestamp":"2025-05-13T06:47:50.501Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.536530Z] Opened J-Link DLL at C:\\Program Files\\SEGGER\\JLink_V818\\JLink_x64.dll with version 8.18","timestamp":"2025-05-13T06:47:50.536Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.540598Z] Found 1 attached J-Link devices","timestamp":"2025-05-13T06:47:50.540Z"}}
{"type":"task_begin","data":{"task":{"id":"df08350c1baa4d83b56ba830c3cdc11b","description":"Recover 1057711395","name":"recover","data":{"serialNumber":"001057711395"}}}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.686314Z] Handshake signatures match","timestamp":"2025-05-13T06:47:50.686Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.686691Z] Connection with Probe worker established.","timestamp":"2025-05-13T06:47:50.686Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.683891Z] {jlink_usb_001057711395} nrf-probe version 0.38.0","timestamp":"2025-05-13T06:47:50.688Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.692034Z] {jlink_usb_001057711395} Opened J-Link DLL at C:\\Program Files\\SEGGER\\JLink_V818\\JLink_x64.dll with version 8.18","timestamp":"2025-05-13T06:47:50.692Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.715969Z] {jlink_usb_001057711395} Clock frequency was set to 2000 kHz","timestamp":"2025-05-13T06:47:50.716Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.715993Z] {jlink_usb_001057711395} Emulator Usb(JLinkSerialNumber(1057711395)) running firmware: J-Link OB-nRF5340-NordicSemi compiled Feb 11 2025 17:15:35","timestamp":"2025-05-13T06:47:50.716Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.818544Z] {jlink_usb_001057711395} -> Powering up sys and debug region","timestamp":"2025-05-13T06:47:50.818Z"}}
{"type":"log","data":{"level":"WARN","message":"[ProbeLib] [2025-05-13 06:47:50.820756Z] {jlink_usb_001057711395} DAP write error: DebugPort,  register DapRegisterAddress(0x08) = 0x00000000, err: Unknown Error in J-Link DLL (error code =-1)","timestamp":"2025-05-13T06:47:50.820Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.821734Z] {jlink_usb_001057711395} <- Powering up sys and debug region","timestamp":"2025-05-13T06:47:50.822Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.929480Z] {jlink_usb_001057711395} -> Powering up sys and debug region","timestamp":"2025-05-13T06:47:50.929Z"}}
{"type":"log","data":{"level":"WARN","message":"[ProbeLib] [2025-05-13 06:47:50.931516Z] {jlink_usb_001057711395} DAP write error: DebugPort,  register DapRegisterAddress(0x08) = 0x00000000, err: Unknown Error in J-Link DLL (error code =-1)","timestamp":"2025-05-13T06:47:50.931Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.932356Z] {jlink_usb_001057711395} <- Powering up sys and debug region","timestamp":"2025-05-13T06:47:50.934Z"}}
{"type":"log","data":{"level":"INFO","message":"[ProbeLib] [2025-05-13 06:47:50.970309Z] Worker exited successfully","timestamp":"2025-05-13T06:47:50.970Z"}}
{"type":"task_end","data":{"task":{"id":"df08350c1baa4d83b56ba830c3cdc11b","description":"Recover 1057711395","name":"recover","data":{"serialNumber":"001057711395"}},"message":"Failed to recover 1057711395, Device error: Failed to write DebugPort register 0x08: Unknown Error in J-Link DLL (error code =-1)","result":"fail","error":{"code":1,"description":"Generic"}}}
Error: One or more recover tasks failed:
 * 1057711395: Device error: Failed to write DebugPort register 0x08: Unknown Error in J-Link DLL (error code =-1) (Generic)


nrfutil device recover --log-output=stdout --json

 

Regards

Khodidas