: Plug the Lexia-3 VCI into the computer via USB (connection to the car is usually not required for a firmware check). Launch Utility : Run the Interface Checker executable.
Click on "Select File" to choose the firmware file you want to flash. Common files to turn a "B" interface into a "C" type include firmware_NLC_pour flash serial B to C.COM or similar .COM files.
Many diagnostic interfaces sold online are "Lite" clones (Revision B). While these work on older Peugeot/Citroën vehicles, they often fail to communicate with the CAN-bus architecture found in newer cars (e.g., post-2010 models like the Peugeot 308 or Citroën C5).
Connect your Lexia interface to your computer via USB. Note that connection to the vehicle's OBD port is usually not required for firmware flashing.
: Flash the VCI with specific firmware to ensure compatibility with different versions of Diagbox. psa interface checker 4.4.0
Running DiagBox inside a VM (VirtualBox/VMware)? Add this filter to your VM’s USB settings:
If you own or service Peugeot, Citroën, or DS automobiles, you know that accurate diagnostics require specialized tools. The is a critical software utility used by mechanics and DIY enthusiasts to manage, verify, and update the firmware of Lexia 3 (PP2000) and Diagbox hardware interfaces.
: Clicking the "Activate" button to initialize communication with the connected USB interface. Version Check
If an interface is accidentally updated through the internet—which can "brick" or deactivate clone devices—the Checker allows users to flash the firmware back to a stable version. : Plug the Lexia-3 VCI into the computer
If you are trying to resolve a specific issue with your diagnostic tool, I can help you find the exact firmware version you need. Tell me: What are you trying to use? What car model and year are you diagnosing? Is your Lexia 3 cable a "Full Chip" or standard clone?
The is crucial for identifying if your interface is fully compatible with newer software.
Power loss or loose USB connection during the firmware rewrite.
: The tool identifies the hardware's current firmware version and "Revision" (e.g., Revision B or Revision C). Common files to turn a "B" interface into
If your VCI recently stopped working after a Windows update, use 4.4.0’s hidden feature: Hold Ctrl+Shift+F9 while clicking “Start Test”. The tool will show the firmware’s revision date. Older interfaces require firmware v4.28 or v4.32 to work with 4.4.0.
Many users still rely on version 3.x or 4.1.x. Here is why 4.4.0 is the current benchmark:
Using PSA Interface Checker 4.4.0 allows you to change the firmware serial number from a "B" type to a "C" type, enabling the interface to function with updated Diagbox software. Key Differences: Revision B vs. Revision C (Full Chip)