Hey,
Have you grabbed the service manual on this forum , to learn how to trick the ECU to giving out the error code ?
Assuming everything is “all hyosung” inside the bike, the dash will say CHE meaning KillSwitch Red Button is active OR ECU isn’t responding OR ECU can’t read the harness to start running the motor.
You said it ran , but what changed if its not running now ?
// Meditation doesn't mean you have to sit still....