Which specific error code or "Failed" message are you seeing on your screen?

If your interface is a clone (specifically those using an ATmega 162 or STM32 chip), it may require a firmware reflash to clear the deactivation flag written by the official software.

Many HEX-V2 clones require 12V power from the car's OBD port to be fully recognized by the software during a test. Plug the cable into your car and turn the ignition to "ON" before running the loader. 3. Repairing a "Revoked" or Locked Cable