jlink problem

[Miroslav]

Hi, My Jlink lite CortexM work with nrf51822 DK boards. But my PCB with nrf51822_xxAA chip can't download code. I'm using ukeil When I chek in utilities Jlink can't recognize SW IDCODE of device. All is set good. PCB is 100% good. Thank you.

[Miroslav]

To be honnest, my PCB is working. It was sent to me by some guy in France. But I cant get him any more. Blinky code is on that PCB and it is working, but connected on jlink chip IDCODE cant be recognized by SWD. Is ther possibility that device is somehove "locked". I saw lock for read and download but lock for ID I never saw... And voltage is 3.3V