No device detected, or readback protection may be set

[Rob Philip]

I have one of the nRF52840-preview-dk boards.

When I brought up nRFgo and clicked on the board, I was invited to update the JLINK firmware. It was pretty enthusiastic in its desire to do that so I said "yes". It successfully did so, or so it claimed, but now whenever I click on the board I get the "No device detected, or readback protection may be set"

I, of course, click "recover" and it claims that it did, but nothing changes.


I already had JLINK version 6.30e on my development machine, and nRFgo seems to have used that.

Additional information - I can successfully load code to the board using the segger development tools (nRF5_SDK_14.2.0_17b948a\examples\peripheral\blinky_rtc_freertos\pca10056\blank\ses\blinky_rtc_FreeRTOS_pca10056.emProject)

And the board connects with the "JLINK" drive for dropping hex files, and I can drag & drop a "blinky" .hex file there.

It's only the nRFgo program that seems to have an issue. 

[Sigurd]

Hi,

Try to open up Windows Command Prompt, and do a nrfjprog --recover

Make sure that SW9 switch is set to VDD, and SW6 is set to DEFAULT

What version of nrfjprog are you using? 

Use nrfjprog -v to find the version.

[vprasath]

Hi,

I'm using nRF52832 soc on my custom board.

I'm facing the same issue"no device is detected" in my nRFgo studio.

even i couldn't able to load the code by keil.

then i tried to recover using the command prompt....still i couldn't able to solve.

Thanks in advance.

[Jaewook]

Any update on this issue?...  

It seems like Chicken and Egg issue.  If you upgraded nrfjprog, you can't connect in nRFgo Studio. If you downgraded nrfjprog, this recover issue...