Here is how to explain the old Motorola key on a Mercedes with VVDI:

There is a key, the idea is to add a new key

There is a way to read the Motorola dump by vvdi Prog

Check you will see it hco5….. , from the Motorola dump you will get the key password . You can then read the eis obd2 by Vvdi mb , punch the key password into the eis dump, calc keys you are done . you can also desolder the Motorola and read it by orange 5, ak500… lots of choices… easy job

Read password with vvdi mb using the the Special adapter and then read the dump by obd using obd reading function, paste the pass inside the dump and then you have ready dump include password to generates new keys