https://devzone.nordicsemi.com/f/nordic-q-a/25220/there-is-no-debugger-connected-to-the-pc-with-the-given-serial-numberMy 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 nrfjprogen-USTelligent Community 13Fri, 01 Mar 2019 05:21:11 GMThttps://devzone.nordicsemi.com/thread/173596?ContentTypeID=1Fri, 01 Mar 2019 05:21:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4fff29d4-8488-417f-8893-f15d468debd7lavande<p>I also caught this problem when I use Jlink cable connect to nrf52832 board for downloading with 52DKboard.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/99372?ContentTypeID=1Fri, 15 Sep 2017 11:45:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9f2d6ac3-5303-4ec4-ac65-23c8ee6a7916MartinBL<p>What kind of debugger do you have? A development kit? If so, can you try or answer all of <a href="https://devzone.nordicsemi.com/question/164807/my-nrf52nrf51-dk-kit-doesnt-work/">these suggestions</a>?</p><div style="clear:both;"></div>