Unable to Flash Blinky

[[email protected]]

Hello,

I just got started with the nRF5340 DK.  I went through the example which instructs how to load the "Blinky" applications, build it, and then flash it to the Board.

Everything works except for flashing it to the board.  I get the following error:

* Executing task: nRF Connect: Build: blinky/build (active)

Building blinky
west build --build-dir c:/nordic/myapps/blinky/build c:/nordic/myapps/blinky

[0/16] Performing build step for 'tfm'
ninja: no work to do.
* Terminal will be reused by tasks, press any key to close it.

* Executing task: nRF Connect: Flash: blinky/build (active)

Flashing build to 1050099720
west flash -d c:\nordic\myapps\blinky\build --skip-rebuild --dev-id 1050099720

-- west flash: using runner nrfjprog
-- runners.nrfjprog: Flashing file: c:\nordic\myapps\blinky\build\zephyr\merged.hex
ERROR: No debuggers were discovered.
NOTE: For additional output, try running again with logging enabled (--log).
NOTE: Any generated log error messages will be displayed.
FATAL ERROR: command exited with status 41: nrfjprog --program 'c:\nordic\myapps\blinky\build\zephyr\merged.hex' --sectorerase --verify -f NRF53 --coprocessor CP_APPLICATION --snr 1050099720

* The terminal process terminated with exit code: 41.
* Terminal will be reused by tasks, press any key to close it.

[Einar Thorsrud]

Hi,

You get the "ERROR: No debuggers were discovered" error (which is also what status 41 indicate) for some reason.

Can you see if the debugger is found with "nrfjprog -i"?

If that works, can you successfully do an "nrfjprog --recover --coprocessor CP_NETWORK && nrfjprog --recover"?

[[email protected]]

Hello,

nothing seems to happen when I try that.  Here is a screenshot of what I am seeing.

[[email protected]]

You are a lifesaver!

I had JLink 7.94e installed.  I believe this was automatically installed during the installation process/instructions.

I then installed 7.88j as you suggested, and it worked!  

Hopefully the installation instructions can be updated to use working versions of JLink.

[kriswilk]

On one hand, I'm very glad to hear that the same process worked for you, too. If you upgrade to 7.94k as I did, does it continue working? It did for me.

On the other hand, I'm hoping Nordic can shed some light on WHY this would be a problem at all, especially if you were using the J-Link installed by the Command Line Tools. That's a problem, especially for a beginner.

In case it matters, the onboard firmware on my DKs was from fall 2022. After all my tinkering and getting everything working, I upgraded the DKs to the latest J-Link firmware (2023-10-30). Everything still working.

Looking forward to hearing what Nordic thinks happened here. Really hoping they can reproduce the problem to investigate it fully.

[robbsadler]

I had the same issue going through the nRF Connect SDK Fundamentals course.

I had installed J-Link 7.96g and got the error "ERROR: No debuggers were discovered."

I ran nrfjprog -i and saw no devices connected

Uninstalled J-Link and installed 7.88j and the device showed up and I was able to flash.

Uninstalled J-Link and reinstalled latest and the device still shows up. Something missing in that later version I guess.

Gonna leave a note in the course feedback.

[BrettS]

I had an identical experience as robbsadler. New laptop.  Issue was resolved by rolling back to J-link v7.88.  Also uninstalled v7.88 and re-installed 7.96h.  Issue remained solved.

Seems like a pattern.

[patratacus]

I had a problem with the 7.94e that got installed automatically with the nRF Command Line Tools install.  I went to segger.com and download the latest Jlink software and documentation pack (7.96I as of this post).  All of sudden my nRF5340DK Jlink shows up in the JLink Configurator.  So I guess it was a driver issue with the older version of Jlink.  Now it's working.