In this video guide, we demonstrate the ECU Advanced function of the OBDSTAR X300 Classic g3 (Keymaster G3), showing how to quickly program a used Mercedes-Benz dashboard for the S-Class W221 model. This function allows you to restore a used dashboard to factory settings and complete dashboard programming.
Important: Before starting any operation, make sure the main cable is properly connected to the vehicle to avoid communication errors.
Step 1: Enter the Dashboard Programming Menu
1. On the KeyMaster G3 device, navigate through the following path:
[ECU Advanced] → [MB BENZ] → [DASHBOARD] → [S-CLASS] → [W221]
2. Tap [Guide] and carefully read the function introduction and menu descriptions to understand the operation process and precautions.
3. Next, retrieve [ECU Info.] to confirm the hardware and software part numbers of the dashboard, ensuring compatibility before proceeding.
Step 2: Back Up the EEPROM Data
Before performing any modifications, it is strongly recommended to back up the original data.
1. Select [EEPROM Backup]
2. Tap [Start] to begin backing up the data
3. You can customize the filename of the saved backup file for easier identification later
This backup file is critical and will be used in the following steps, so make sure it is saved correctly.
Step 3: Virginize the Used Dashboard
Now, execute the [Virgin Dashboard] function.
1. Carefully select the correct backup file
2. Double-check the file before confirming
3. Tap [OK] to proceed
Once completed, the used dashboard will be restored to factory (virgin) status:
1. The mileage will be initialized to its initial display state
2. The SSID synchronization code will be cleared
Step 4: Program the Dashboard
After virginizing the dashboard, proceed with the dashboard programming function.
When the device displays [Programming complete], it means the used Mercedes-Benz W221 dashboard has been successfully programmed and is ready for use.
For a full step-by-step visual demonstration, please watch the video guide:
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