The most successful method for many users is using third-party software like VueScan . They have developed their own drivers for thousands of abandoned scanners. While the software eventually requires a purchase, it is the most reliable way to bypass compatibility issues on Windows 10 and 11.
Without the correct driver, your operating system will recognize the scanner as an "Unknown USB Device" or not at all. The driver acts as a translator, converting your OS commands (e.g., "Scan at 300 DPI") into instructions the hardware understands. Benq Scanner 6678-9bz Driver Free Download