Different BMW key programmers recommendations on making BMW EWS and CAS1- 4 key. First is the guide on making ews4 key. Below is the EWS 4 soldering point diagram using xprog m ECU programmer (v5.50): 
Using ak90+ key programmer to read ews4 2l86d in circuit and no problems for now, this is diagram BMW key programmers needed to make key for CAS 1 to 4 For cas the best tool is tmpro, especially CAS3+ I have tested all and only this can make key to all situations so you need a good tool for read/write CAS Rosfar(original for me) or R270 key pro on table Abrites via obd. BMW multi tool via obd/ eeprom AK300 key pro via remove CAS, work with CAS1, CAS 2, CAS 3, CAS3+ Motorola 912/9S12/9S12X Programmer is cheap at twice the price and also fgtech galletto is to read ECUs because it is necessary to have eeprom file to TMpro.
Using ak90+ key programmer to read ews4 2l86d in circuit and no problems for now, this is diagram BMW key programmers needed to make key for CAS 1 to 4 For cas the best tool is tmpro, especially CAS3+ I have tested all and only this can make key to all situations so you need a good tool for read/write CAS Rosfar(original for me) or R270 key pro on table Abrites via obd. BMW multi tool via obd/ eeprom AK300 key pro via remove CAS, work with CAS1, CAS 2, CAS 3, CAS3+ Motorola 912/9S12/9S12X Programmer is cheap at twice the price and also fgtech galletto is to read ECUs because it is necessary to have eeprom file to TMpro. 
