If you own a Ross-Tech HEX-USB or HEX-V2 cable for VCDS (Vag-Com Diagnostic System), you may have encountered driver issues after upgrading to Windows 11. While Windows 11 is largely compatible with Windows 10 drivers, Microsoft’s stricter driver signature enforcement often blocks older, unsigned, or improperly packaged drivers.

Here is the step-by-step guide to getting your Ross-Tech interface working correctly on Windows 11. When you plug a Ross-Tech cable into a Windows 11 PC for the first time, Windows Update will automatically try to install a generic USB Serial driver. This driver will not work and will cause your cable to show up as "USB Serial Converter" or fail to communicate with VCDS.