Unfortunately, it seems that this device may have a hardware issue.
Could you please email us the order information and include a link to this post in your email to support@gl-inet.com?
Our RMA team will follow up and assist you with the warranty process.
How long have you been using your comet? Could you describe the information before and after the failure? Did this error occur only after modifying the EDID? Was the video working properly before that?