Why can customer service not guarantee 100% support for a specific function?

Automotive electronic operations are affected by many factors, including: Vehicle year, ECU/module version, Immobilizer system type, Software version, Whether an online account is required, Whether Token or authorization is required, Whether special cables are required, Whether the vehicle has been repaired or modified before. We will try our best to confirm the supported range based on available information. However, the actual function still depends on the menu and test result after the device is connected to the vehicle.