A hardware conflict or a cheap optocoupler design inside low-quality clone tools causes a voltage spike when the vehicle battery grounds out through the USB port.

The "Driver" is the software package that allows Windows to recognize the Actia interface. Without the correct drivers and firmware, DiagBox (the diagnostic application) will not be able to communicate with the car's ECUs. 1. Preparing for Driver Installation (Crucial Steps)

Installing the driver correctly is crucial to avoid "Actia USB Device" errors in Device Manager. 1. Initial Setup and Connectivity