Attached nRF52DK to my PC, unable to flash.

[sudarshanj645]

Hello, 

I am using a nRF52DK (PCA10056). When I connect the board, the J-link drive opens up, but it does not detect on nRF Go Studio, nor is it flashing any code. I am using SDK 15.2 for PCA10056. I re-installed the GoStudio, Command line tools and Jlink for 64 bit windows, to no avail. Looking for any suggestions and help I can get. Thanks

[cbd]

When you connect the board to your PC via USB you should see a Jlink CDC UART Port appear within DeviceManager.

If not try a different USB port, if that still doesn't work then you may have a driver or a board issue.

When connected LED5 next to the PCA10056 labelled chip should be constantly lit if the board is working.

It's possible that you may have accidentally corrupted the interface MCU firmware.

You can verify this by disconnecting the board, then reconnect it whilst keeping the "IF BOOT/RESET" button pressed. Keep this button pressed for around 10 seconds, in which time LED5 short start flashing and a File Explorer window titled BootLoader should pop open.

Copy the IF firmware located on https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK/Download#infotabs

into the file explorer window. The LED will flash at a fast rate. Power cycle the board and it should now talk again and show up as a COM Port

[Yogeshwaran]

I had a same issue with my 52DK which has no firmware and this post solved the problem.

Thanks.