I got the errror handler in the src\gap_core.c line 1473. It happen when i do those steps with NEXUS 7 II. Step1: Use the Bluetooth to connect to the nRF51422 Step2: Enter the incorrect passkey. Step3: connect the the same device again. Step4: Enter the correct passkey After Step1~4,the error happen If I use the NEXUS 5,this problem is not happen. Could you track the gap_core.c and tell us what wrong?