Unable to connect E-Tube app or STunlocker app

[raf]

Can anyone help, for some reason I can no longer connect either app with bluetooth. They both ask me to enter PIN (which I never set afaik). I have had the PIN reset to default by a shimano service center but I still get "Bluetooth connection interrupted" on etube or "Wrong PIN..." on stunlocker. I have tried on another device and tried both IOs and Android with same result.

 

[raf]

For the record, I finally connected using pin 123456, kind of odd as the default pins are afaik 4 digit and 1234 or 0000