nordic board nrf52dk not working

Hello, 

I was working on a ble communication using two nrf52dk boards while one of the two stop responding. The board is correctly recognised by the computer and segger asks me to choose in which board should it execute the code, which is correct, when i connect the board to the pc led5 is on. However when i execute the code, even if it is the same, on the not responding board the deug terminal is empty, if i execute the same code on the other board than the debug terminal correctly shows me the logs. I also tryed to execute the blinky example in the peripheral examples in both of the boards, with the working one led5 is blinking while led1 remains on, in the other board led5 is blinking while led1 is off.

I tryed to switch the wires, to change the com, to switch on and off the interrupt for the board but the result is the same.

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