Windows 10 rarely identifies these cables automatically. You must manually install the drivers for the specific chip inside your cable, which is usually either an or a CH340 chip.
This is the most critical step where many users get stuck.
Before plugging in the cable, it is best practice to install the diagnostic software so the drivers are ready. how to install vag kkl 409.1 on windows 10
If drivers fail to install with “Digital signature not verified”:
The biggest hurdle on Windows 10 is that it often won't recognize the cable automatically, or it will install a driver that doesn't actually work with the VAG software. : Do not connect the cable yet. Windows 10 rarely identifies these cables automatically
Before plugging in the cable, identify the internal chip to download the correct driver: FTDI (FT232RL): Common in higher-quality cables. Download the official FTDI VCP drivers
Disable Driver Signature Enforcement (Temporary) Before plugging in the cable, it is best
Click Install . Wait for the confirmation. If it says “Driver installed successfully,” proceed.