hello,
I make key for the BMW X3 EWS4, I took the unit out from vehicle, soldered the apa109, conect IM508 and xp400 pro and downloaded backed up EEPROM, then I try to add a new key, every time I try to write the 7935 chip to 4 (or any) position, it ends in failure. I tried other chips but always the same result. Can you help?