Change the to COM1 , COM2 , COM3 , or COM4 . (If they are in use, pick one anyway—it is usually okay).
A: It indicates that the driver is not installed or is incompatible. Uninstall the device, reboot, and reinstall the correct driver.
Double‑click Install.exe (or setup.exe ) and run through the installation. This will install the underlying USB‑to‑serial drivers.
Disclaimer: Ensure you are using legitimate software and that your cable is not faulty. vag kkl 409.1 driver windows 10 64 bit
A common budgetary alternative. It utilizes unique driver architecture and requires different baud rate overrides to talk to older ECUs. Step 2: Download the 64-Bit Virtual COM Port Drivers
Now, to configure VCDS-Lite:
In Device Manager, look for USB‑Serial CH340 (COMx) under Ports (COM & LPT) . Change the to COM1 , COM2 , COM3 , or COM4
The CH340 driver is generally signed, so no signature disabling is needed on recent Windows 10 builds.
Here's how to change it:
The biggest challenge is that these cables often use older CH340G or FTDI chipset drivers that are not digitally signed for Windows 10, or they require a specialized Virtual COM Port (VCP) driver to operate correctly. Uninstall the device, reboot, and reinstall the correct
Have questions about a specific error code or chipset? Drop a comment below (or consult the diagnostic forums at Ross-Tech or MHH Auto). Happy diagnosing!
VAG KKL 409.1 Driver Windows 10 64-Bit: Full Installation Guide
Windows 10 64‑bit enforces driver signature verification by default. Unsigned drivers (common with cheap CH340 cables or older driver packs) may be blocked.