One customer gave feedback that his VVDI2 Key Programmer failed to add key for BMW X1 2019 by OBD. And now BDC module has no communication.
Now BDC module is bricked from “Current key in ignition = NO KEY”.
Here is the
Unstable or improper voltage during unlocking.
Try to unlock in bench with power supply stable at 13.5v.
Try several times until flash writes ok.
Hope this could help!