Here is the procedure:
Step 1. Password Calculation
Select OBD Mode, lost all working key, and w204 fast mode.
Click “Data Acquisition” to start password calculation.
Here we use free token, since we have an Xhorse Key Cutting Machine.
Around 18 minutes later, we have the password.
Step 2. Read EIS
Read and save EIS data.
Step 3. Prepare Key
Load EIS file we just saved.
Paste password we just got.
Select key postion and “v051” to prepare dealer key.
Step 4. Add Key
Identify BE key.
Since it’s an used key, so we erase it.
Load key file.
Paste key password and write key.
Start the vehicle no problem.
Any questions, contact us.