How CGDI Prog MB Program W221

CGDI Prog MB Tool is a young and professional Benz key programmer which has a cheaper price.  It makes it be a more affordable tool for some locksmiths.

This post will show how CGDI Prog MB program Benz W221 Key. You could see how it works.

This process will cost 20 minutes in 5 steps.


Step 1: Preparation & ready for 221MTSkey programming

Finish connection of CGDI Porg MB to the laptop and the car

Run CGDI Porg MB software


Step 2: Read and save EIS data

Go to EIS: read EIS and save EIS data


Step 3: Calculate password

Calculate password: collect data

(the car voltage should be more the 11.5V)

Remove the key from EIS, then click on OK

Again remove the key from EIS, then click on OK

Remove the key for 5 seconds, then insert it into EIS, then OK

Put the key into the CGDI Porg MB programmer, then OK

Save data, then upload data to calculate password

Search for the result

Copy the password

Go to EIS: read EIS, paste password, then save data


Step 4: Make key file

Generate EE: load EIS and make key file


Step 5: Write data into the key

Read & write key: read key/chip data, reset, open/write key

Important note:

smart key: format 41, normal key or key from deputy factories: format 51

Write data into the key successfully


Step 6: Check if the key is work or not

Test the key and it’s working

Job’s done!


Reference: VVDI MB BGA TOOL program W221 keys


To add new keys to W221 when it lost all keys, you can do like this:
remove W221 EIS,

get eeprom by programmer (such as VVDI PROG),

then load eeprom to VVDI MB TOOL to prepare key file,

write key and insert to EIS for key learn.