KS-14C Bluetooth PIN reset?

[John Eucist]

I just sold one of my old 14C.  He said he had trouble connecting the app to the wheel.  So my questions are as follows for the APP BT (not music BT):

1) What is the default PIN for KS-14C?
2) Can the PIN be changed? (I'm trying to figure out if I changed it once upon a time)
3) Can the PIN be reset?  If so, how?
 
Thanks.