How to tell if the BCP key is with or without UWB function?
Disassemble the key shell, for BMW U keys with UWB functionality, the code here is CA, while for those without UWB functionality, the code here is CG.
UWB key also has a J29D5Cchip on key board.
For CG key without UWB, u can write KD FGB57 remote.
For CA key with UWB, u can write original key only.
KD App will add this function in a day or two.

https://www.carobd.de/wholesale/keydiy-kd-fgb57-remote-key.html
Requires BMW G/FEM function activation (5000 KD coins or 100USD).
Each key copy operation will deduct 180 points.