| 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) |
You often need specific CH340 drivers (sometimes labeled "CH341SER"). These are common in many affordable Chinese clones and Arduino-compatible devices Manual Update: how to install vag kkl 4091 on windows 10