No emulators connected via USB on nRF51 and nRF52

[wendytang2000]

I just recently got both nRF51422 and nRF52844 DK. However, when I tried to connect through J-LINK, the error message popped up: No emulators connected via USB. Do you want to connect through TCP/IP? 

I have checked in Device Manager that J-link has showed up under COM port and USB controllers:

So far, I have tried many things individually as following to no avail. I tried on two boards and they appear to be working with LE5 blinking. 

1. install the latest segger embedded studio for x64 and x86;

2. install the latest J-link software pack for windows;

3. manually update the driver for J-link: 

4. manually select the USB driver under SES: 

5. update to the latest MCU firmware (J-Link OB-SAM3U128-V2-NordicSemi 170724.bin)

6. switch to a different PC also using windows 10;

7. switch to a different USB cable;

8. switch to a different DK;

9. step 1- 8 individually with rebooting my PC and reopen SES;

10. tried to connect J-Link through TCP/IP. But I failed to find the correct s/n of J-link;

11. measure the voltage of pins to make sure the board is good; 

At this moment, I ran out of ideas to try and would appreciate any input. Thanks. 

[wendytang2000]

Today, I tried what you suggested. Unfortunately, the issue persists. I got the same log file. Is it possible to set up a zoom meeting with you to troubleshoot? I just want to connect to the board so I can start to write some sw. Thanks. 

[Einar Thorsrud]

Hi,

I have discussed this with a few collogues an none of us are able to explain this, as you should have covered everything with the list form the initial post, and everything seems good from the device manager. Can you ask a collogue of you to try and see if he/she can get it to work, just in case there is an issue that is repeated that we do not spot?

Other then that I think we have almost exhausted all ideas allready, so I do not see that this would be solved faster by a conference call.

[wendytang2000]

Hi Einar, today I switched to HP instead of another microsoft surface pro. The following message showed up when I segger J-linked to USB. After clicked on Yes, it updated the firmware then I was able to J-link the board. Although I updated the firmware using drag and drop before, I didn't think it was done successfully without proper initialization. 

After the firmware was updated, I was able to J-link to the board using my own PC. 

Thanks for your help!

Wendy