Here is a guide to renew/virgin a second-hand engine computer for Mercedes W203 C270 CDI, before replacing the old one.
ECU type: BOSCH EDC15C6 CR2.
Device used to renew: Xhorse vvdi key tool plus
Connect vvdi key tool plus with EDC15C6 ECU. You need to find pinout by yourself.
Get erase password successfully
Read ECU data again.
ECU is personalized and deactivated.