How to Solve Autel IM508S BMW FEM/BDC Mismatch Versions Error?

Problem:

A user encountered an issue when attempting to add a key to a BMW X2 using the Autel IM508S and GODIAG BDC/FEM Test Platform.

The process, which previously worked without problems, now fails.
After failure, the system attempts to automatically restore the EEPROM but shows a “Mismatch Versions” error.
Cannot read BDC with power applied, but initial read without power was possible.
The user asks how to repair the BDC and successfully add a key again.

Solution:

When using Smart Selection mode, Autel automatically backs up the coding and original EEPROM files. You have two options:

Reinstall all components back into the car and perform a restore.
Locate the original EEPROM backup file and manually restore it. (Finding the correct file can sometimes be difficult.)

Important:
BDC modules use different types of EEPROM chips. Ensure you are reading and restoring the correct chip data.

Tips:
Don’t worry! Instead of using Smart Mode, switch to manual operation:

Navigate to IMMO → BMW → By System → IMMO → FEM → Key Operation → Key Learning.
Perform “Preprocess Learning” manually.

User feedback:
The issue was successfully resolved by manually proceeding through the steps outlined above, without using Smart Mode.

Tech support:

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