In order to prepare a CAS 4 key by dump you need to:

• Read the XEP100 MCU’s EEPROM and save it to a file.

• Load the file into the TAG key tool and select the correct key position.

• Use PCF7939 transponder or a new remote key.

• Prepare the key.

• You will be asked to either read the working key or enter the DME/DDE ISN. Please use the checkbox option according to the situation (Working key or DME/DDE ISN). Once the option is chosen, please use the “Prepare Key” button to prepare the key for programming.