BMW Multi Tool User Manual page 13

iii. EEPROM Function: Read EEPROM，Write EEPROM，Save File，Load File...
1． You should backup the CAS EEPROM before prepare dealer key. After
succeed read EEPROM, please save it as back file. This step is very
important.
2． Now can't read the whole EEPROM for cas3 system. But the main
section is contained. It should be saved. When you read CAS EEPROM, it
will give tips as follow(Press ok to continue):
BMW Multi Tool User Manual
13