Windows 10 overwrote your driver with a generic or incorrect version. Fix:
: Often listed as "USB Serial Converter" or "FT232R USB UART". CH340 Chipset : Listed as "USB-SERIAL CH340". ElectroPeak Step 2: Install the Drivers
If you get "Too many communications errors," try reducing the in the software settings to Driver Signature:
Once the drivers are installed, the cable will be assigned a COM port number. This port number must be within a specific range for legacy diagnostic software to function correctly.
| Problem | Solution | |--------|----------| | Code 10 (device cannot start) | Reinstall driver with signature enforcement disabled | | No connection to car | Check KKL cable has soldered pins 7+8? (Some clones miss them) | | Random disconnects | Set latency to 1 ms; use USB 2.0 port (not USB 3.0) | | Works on old laptop but not on Windows 10 | Try older driver (FTDI: 2.08.14 / CH340: 3.4.2019) |
Always use the same physical USB port on your laptop. Alternatively, in Device Manager > Advanced COM settings, you can assign the same COM number to all ports.
: It is recommended to download specific drivers, such as the CDM v2.12.28 WHQL Certified from FTDI Chip.