Bentley Continental - story about ECM

Someone would like to send this Bentley for me to install ECM and I had rejected him due to security issue but he keep insisted, I though OK is fine probably something else, once car is here
it turned to change engine ECU again......   

For my dear follower if your happened to change engine ECU it involved
immobilizer synchronization and need security code to gain access, It is highly protecting by VW group.

To solve this problem is either you have security code to access VW server or OEM key programmer or else you can't do anything on it. Unless you have back door.