https://devzone.nordicsemi.com/f/nordic-q-a/19468/how-can-i-update-my-passkey-using-sd_ble_opt_set-on-runtimeHello everyone, I successfully implemented the static key to access a characteristic now I want the user to udpate the passkey through another characteristic (which is also protected). I successfully read the value of the passkey entered by the useren-USTelligent Community 13Mon, 06 Feb 2017 02:43:10 GMThttps://devzone.nordicsemi.com/thread/75617?ContentTypeID=1Mon, 06 Feb 2017 02:43:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d822ec2c-bf86-46e8-a6bc-f26ae03b1e71RK<p>If all 4 LEDs are lit you&#39;re in the fault handler which means you&#39;ve called a call with some invalid parameter, received an error and app_error_check() has gone to the fault handler. Put a breakpoint in the fault handler and trace the error back to the call to find out what error code was returned and then figure out why.</p><div style="clear:both;"></div>