nRF52 DK cannot connect to J-Link

Question

Hi, guys. 
 I'm using nRF52 DK (PCA10040). After I used Zadig (Driver setup for J-link), I cannot build and run my previous code to the nRF52 DK anymore (see the first 3 images). 
 On Zadig, here is what I did (plz see the 4th image). 
 I tried to restore the driver to the original version, but I didn't found the correct way to do it in "device manager" (see 5th image). 
 Thanks guys

tesc · Accepted Answer

Hi, 
 In addition to the "JLink CDC UART Port (COM4)" listing under "Ports (COM & LPT)", there should be a second entry named "J-Link driver" under "Universal Serial Bus controllers". Instead of that entry, there might be a differently named entry, and it may even be in a different category. For instance "USB bulk driver" under "Universal Serial Bus drivers". Or something completely different, depending on what driver you have replaced the J-Link driver with. 
 You need to figure out what entry this is. One way is to unplug the DK, and see what entries have disappeared, then plug it in again and confirm that the entry reappears. It can be a bit cumbersome, but that is what I did when I had this issue last summer. 
 Once you find that other entry, right click and select "Update Driver", then select "Browse my computer for driver software". Instead of browsing for the driver location, select "Let me pick from a list of available drivers on my computer". You should then get a list where "J-Link driver" is one of the listed alternatives. Select the J-Link driver, click "Next", and the driver should get correctly installed. 
 Regards, Terje

nRF52 DK cannot connect to J-Link

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