There is no debugger connected to the PC with the given serial number.

[???]

My computer can connected to debugger , but when I key the command it like this

==================command start=====================

cd /d C:\Program Files (x86)\Nordic Semiconductor\nrf5x\bin

nrfjprog --program burn.hex --sectorerase

nrfjprog -r

==================command stop======================

It will show

ERROR: There is no debugger connected to the PC with the given serial number.

How can I fix it ?

[MartinBL]

What kind of debugger do you have? A development kit? If so, can you try or answer all of these suggestions?

[lavande]

I also caught this problem when I use Jlink cable connect to nrf52832 board for downloading with 52DKboard.