Can't connect via RTT on nRF9151 custom board

RE: Can't connect via RTT on nRF9151 custom board

Guillaume59 — Tue, 16 Sep 2025 10:11:58 GMT

Hello,

Yes I had exactly this problem, I also had all the other symptoms that you described. Your solution did fix the SIP detection problem in VScode, thank you very much.

Although I also have APPROTECT enabled as mentioned by Michal, but it is not really blocking as it prevents debugging but not log reading.

RE: Can't connect via RTT on nRF9151 custom board

vincent_itk — Mon, 15 Sep 2025 15:40:29 GMT

Go the same error on Linux Ubuntu 25.04. Here is how to fix it :

ln -s ~/.vscode/extensions/nordic-semiconductor.nrf-connect-2025.9.754-linux-x64/platform/nrfutil/lib/nrfutil-device/plugin-probe-worker ~/.vscode/extensions/nordic-semiconductor.nrf-connect-2025.9.754-linux-x64/platform/nrfutil/bin/plugin-probe-worker

Seems to have an error in the nrf vscode extension

RE: Can't connect via RTT on nRF9151 custom board

frankenboom — Mon, 15 Sep 2025 00:04:56 GMT

I had this exact same issue on M1 MAC (I think it started randomly, but possibly after updating an nrf extension not sure) and this fixed it. Thank you.

RE: Can't connect via RTT on nRF9151 custom board

pr0b3 — Sun, 14 Sep 2025 11:04:56 GMT

Hi , I've face similar issue ,I Solved it , but my simptoms were little bit different :

I will document it here in case somebody will face the same problem , before Nordic will address it.

Installed SDK and Toolchains 3.1.0
I have OB J-link .
J-Link 8.6v Installed.
Working with nrfutil

J-link was recognized by nrf Connect Extension , but on "Connected Devices" I've had situation :

i.e. SoC NRF52833 ,did not recognized. Althought, I was able to flash and debug the SoC via "Actions Menu"

more over, when I've tried to apply one of hardware commands (reset , erase , recover) to the board via "Connected Devices" Menu , I've received the error message that It failed with message :

[11:22:51] nrfutil-device device-info --serial-number 000052007917 --skip-overhead --json
[11:22:51] Error: One or more device info tasks failed:
 * 52007917: Unable to find worker executable: Custom { kind: NotFound, error: "Failed to find file plugin-probe-worker. Looked for file in <none>, <none>, C:\\Users\\VssAdministrator\\.cargo\\registry\\src\\eu.files.nordicsemi.com-aeee3781a8ecf169\\target/release\\plugin-probe-worker.exe and c:\\Users\\%USERNAME%\\.vscode\\extensions\\nordic-semiconductor.nrf-connect-2025.9.754-win32-x64\\platform\\nrfutil\\bin\\plugin-probe-worker.exe" } (Generic)

Also ,when I've performed the same command

nrfutil device device-info --skip-overhead --json

manually from terminal , everything worked correctly.

From your and my message I can understand that problem is with extension's pathes and nrfutil related.

What helped to me is just copying the

plugin-probe-worker.exe

file from

C:\Users\%USER%\.vscode\extensions\nordic-semiconductor.nrf-connect-2025.9.754-win32-x64\platform\nrfutil\lib\nrfutil-device

C:\Users\%USER%\.vscode\extensions\nordic-semiconductor.nrf-connect-2025.9.754-win32-x64\platform\nrfutil\bin

RE: Can't connect via RTT on nRF9151 custom board

Michal — Fri, 12 Sep 2025 21:03:57 GMT

Hello Guillaume,

Looks like you have APPROTECT enabled.

Please take a look here on how to disable it in your config (though only for development).

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/security/ap_protect.html#disabling_software_ap-protect_with_confignrfapprotectdisable

Best regards,

Michal