Question:
Smart key version 42, the key was detected by xhorse vvdi mb tool. But the vvdi mb is not able to write this type of key.
Answer:
Your key are newly bought by benz dealer, are protected through unique password, only seller know this and can use/programmed them.
need reset NEC to factory state, when you will use them normally. Otherwise no way.
http://blog.vvdishop.com/xhorse-vvdi-mb-cannot-write-smart-key-version-42/