How to slove the error“Load File Failed, error code: 27E1”for CGDI Prog MB Benz Car Key Programmer?

Here’s the final solution to CGDI MB key programmer error: “Load File Failed, error code: 27E1” (shown picture below)



Possible reasons that cause the error:

1).  Device fell on the ground and damaged

2).  Take apart the CGDI main unit manually


CGDI Prog MB host is equipped with an encrypted battery. If you disassemble the programmer, the encrypted battery will power off automatically.  BenzMonster software refuses to run properly.


What is more, the battery cannot be purchased separately nor installed by yourself.


The ONLY solution is to send CGDI back to repair.



Always read CGMB label and directions carefully before beginning use.


How to activate CGDI Prog MB? 

CGDI Key Programmer for MB needs activation when you receive it. Please follow the steps as below:

  1. Download for Benz Monster software from official website, there will be user manual too in the software catalogue
  2. Install software on your laptop and read out serial number of your CGDI
  3. Pass serial number to our customer service, when activation is done, please restart CGDI Prog for Benz and for Benz Monster software, it will be ready to use.


How to Use CGDI MB Programmer Add Key for Benz? 

CGDI Prog MB is able to add for Mercedes Benz car keys as well as program new keys when all keys are lost.

Step 1: Click on “Lock (EIS)

Step 2: Click on “Read EIS data”

Step 3: Click on “Computer Password”, then click on “Copy key with key”

Step 4: Click on “Other Keys” (One generation of key 705E6 key), then click on “OK”.

Step 5: Please insert the key into EIS and click OK.

Step 6: Please insert the key into the device and click on OK!

Step 7: Collecting the data, do not remove the key.

Step 8: Please insert the key into EIS and click OK.

Step 9: Please wait for 7 seconds.

Step 10: Please pull out the key from the EIS, and then click OK!

Step 11: Please insert the key into the EIS again and click OK!

Step 12: Unplug the key for 5 seconds, then insert the EIS, then click OK!


Step 34: Select chip type.

Step 35: Note: Smart key please choose 41 format, common key and BE key please choose 51 format!

Step 36: Select the location of writting key, then click on “Open”.

Step 37: CGDI MB Write key success!

Step 38: Password display area, write down the password manually.

BE key read password directly, no need to collect data!

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