nrfjprog --recover fails when flashing nRF52840_XXAA

RE: nrfjprog --recover fails when flashing nRF52840_XXAA

Menon — Wed, 12 Mar 2025 08:21:50 GMT

Hello,

Try running the eraseall command. You can also do the same using the nRF Connect Programmer app, where you will find a button for the eraseall function.

See this blog post on AppProtect, where they explain a few steps.

Kind Regards,

Abhijith

RE: nrfjprog --recover fails when flashing nRF52840_XXAA

Gabriel Cohen — Mon, 10 Mar 2025 20:42:39 GMT

Hi Abhijith,

Thanks for the suggestions. Here’s my setup and what I’ve tried so far:

I'm using nrfjprog version 10.24.2 (external) with JLinkARM.dll version 7.94i. My DK is powered directly via USB from the PC, and the power LED confirms it’s getting proper power. In Device Manager, the board shows up as a JLink CDC UART Port on COM9 and COM10, and when I run nrfjprog --ids I get the serial number 1050304532.

I attempted to use nrfutil commands, but it appears that the device listing commands have been removed in the current version. Instead, I confirmed the board is detected using nrfjprog --ids.

I’d appreciate any further suggestions or alternative recovery methods to clear the protection. Thanks in advance for your help!

Best regards,
Gabriel

RE: nrfjprog --recover fails when flashing nRF52840_XXAA

Menon — Mon, 10 Mar 2025 16:44:31 GMT

Hello,

What version of nrfjprog are you using here? How is your DK powered? Please make sure it is powered properly. Is your DK detected properly by the PC?

I also recommend trying the nRFUtil commands to see if the DK is responding.

Kind Regards,

Abhijith