Unsupported Device: The Device could not be recognized as neither JLink nor Nordic USB Device

[Stevenism]

Hello I am trying to program an external custom board that has an NRF52832 on it and I'm using the NRF52840-DK (Development Kit). The programming is being done using SWD over a Tag Connect interface to the Target board and using the NRFConnect Programming tool.
The very first time that I programmed this device was successful without any issue and everything worked great.
For some reason when I attempted it a second time the next day, the NRFConnect Programming utility was giving me this error (see Subject name).

I have since downloaded J-Flash and have successfully connected to the target and Programmed/verified, but for some reason the programmed application does not run when using J-Flash. I know this program runs correctly because It is the initial one that I flashed onto my Target using the NRFConnect, the target NRF52 was then connected to our products App over BLE and everybody was happy.

This all seems like a possible driver issue imo.
Any help appreciated.

NRFConnect LOG:
2021-03-30T21:03:37.477Z INFO Application data folder: C:\Users\billh\AppData\Roaming\nrfconnect\pc-nrfconnect-programmer
2021-03-30T21:03:38.203Z DEBUG App pc-nrfconnect-programmer v1.4.8 official
2021-03-30T21:03:38.204Z DEBUG App path: C:\Users\billh\.nrfconnect-apps\node_modules\pc-nrfconnect-programmer
2021-03-30T21:03:38.205Z DEBUG nRFConnect 3.6.1 is supported by the app (^3.6.0)
2021-03-30T21:03:38.209Z DEBUG nRFConnect path: C:\Users\billh\AppData\Local\Programs\nrfconnect\resources\app.asar
2021-03-30T21:03:38.211Z DEBUG HomeDir: C:\Users\billh
2021-03-30T21:03:38.212Z DEBUG TmpDir: C:\Users\billh\AppData\Local\Temp
2021-03-30T21:03:38.337Z INFO Using nrfjprog library 10.12.1, pc-nrfjprog-js 1.7.6
2021-03-30T21:03:41.588Z ERROR Unsupported device. The detected device could not be recognized as neither JLink device nor Nordic USB device.
2021-03-30T21:03:45.627Z INFO Target device closed.
2021-03-30T21:03:47.014Z ERROR Unsupported device. The detected device could not be recognized as neither JLink device nor Nordic USB device.

[Edvin]

Hello,

Can you please try to use nrfjprog (nRF Command Line Tools)?

Is the hardware powered externally? The programmer on the DK doesn't power the other device, so make sure it has the same power as your DK, and that they have the common GND (short the GND on the two devices together). 

Can you show me how you connected the DK to the external board?

 

The programming is being done using SWD over a Tag Connect interface to the Target board

 Do you mean P20 on the DK? Or are you using P19? If P19, can you please let me know what wires you connected where?

BR,

Edvin

[Edvin]

FYI, if you are using P19, it should be connected like described in this post:

https://devzone.nordicsemi.com/f/nordic-q-a/14058/external-programming-using-nrf52-dk/53757#53757

Note that VDD on the external board is connected to both VTG and VDD on the DK, just like GND on the external bord is connected to both GND_DETECT and GND. This will both supply power and make sure they have the common GND. VTG and GND_DETECT are used only to check whether an external target is connected to the debugger.

If this is not the issue, have you tried running "nrfjprog --recover"? This is needed if you have enabled readback protection from your project/application.

BR,

Edvin