RE: PSA: Nrfutil may not recover NRF5340 network core with 3rd party J-Link

Vidar Berg — Mon, 22 Dec 2025 12:07:05 GMT

Hi,

Thank you for reporting this. I will add it to our internal bug tracker. Since it's working with nrfjprog but not nrfutil device I think it may be worth looking into it.

Best regards,

Vidar

EDIT: forgot to ask if Nrfutil device is up to date. You can run "nrfutil device --version" to check the version number (latest version at time of writing is v2.15.7) and "nrfutil upgrade" to install the latest version.

EDIT 2: developer requested error information from the "west flash --recover" command:

"Yeah, would be good to understand why it fails here.

They didn’t mention how it failed, could you ask them what error message they get in west flash --recover?

Assuming it’s the recover step that fails (and not the programming step afterwards, or the app core recover later), it would be interesting to see the log in <USERHOME>/.nrfutil/logs/nrfutil-device.log from nrfutil device recover --core Network --log-level trace after they’ve put the network core in the state where it’s protected, and the same for nrfjprog --recover --log <path>."