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Blinky SDK not working as expected

Hello, I am using the nRF51422 development kit.  The SDK I am using is the nRF5_12.3.0_d7731ad.  I am trying to run the "Blinky" example by copying the hex file for the PCA10028 device.  The issue is that when the hex file is copied into the J-Link removable drive only LED1 is illuminated and it stays solid (does not blink).  None of the other LEDs are illuminated.  Why might this be?  

Thank you.

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