J-link communication timed out

[puchuan]

I have nRF52 Development Kit,after my first time programming the Firmware to my board.I can't erase or program it any more? The nRF52 Development Kit can be connected with J-link,but when I want to read or write any thing from the Kit,It restarts over.Everytimes,It's happenedto me. Is there anyone can help me ?

[Hung Bui]

@puchuan: You mean you have managed to flash the chip only once ? Have you tried to open the board using nRFGo Studio application ? Please make sure the board is powered properly. Do you see a new hard driver added to your computer when you plug the cable in ?

[puchuan]

I have tried to connect kit with nRFGo Studio application ,and in the frame of "Device Manager" I can find my device,but if I double-click the line of "Segger 682183739",the kit restart,it seems like J-link is restart. In my conputer's device manager,I can find my hard devicer,and my device port is COM4. My next answer has some picture about this situation.