nRF SDK external device not detected

[nsugie]

I'm using nRF SDK and trying to write firmware to my prototype device. However, nRF SDK doesn't detect my prototype device. I checked the power supply to my prototype device, and looks okay.

[FormerMember]

Do you mean that it is not possible to program the chip on your custom board?

If that is the case, which error message do you get from nrfjprog if you run nrfjprog --recover -f nrf52 for instance?

Could you upload schematic, layout and and picture of the board? For the schematic and layout, only the programming part is needed.

[FormerMember]

As I asked yesterday, which error code do you get from nrfjprog when you use nrfjprog from cmd?