Firstly, remove the chip of ECU, ESL of your BMW car, insert it to AK90 diagnostic tool, then it will read the date information of your car.
Secondly, plug the key into ak90 programming keys
, which reads the data information of your car key.
Then, the information of your car and your key is matched, then the AK90 key maker will tell what's next step, so you just following it is ok, step by step, you will get what you want.
When making the new keys, you can insert the ECU and ESL to your car, and insert the key; it can star your car then.