Hi Herman nguimkeng We sincerely apologize for the confusion you encountered with our product. This misunderstanding arose because our product automatically activates its self-check function by design—whenever it is powered on, it initiates this self-check cycle first. We deeply regret that our initial guidance did not clearly highlight this key operational detail, as this oversight could have helped you avoid the confusion entirely. Should you have any follow-up questions, need further clarification, or require additional support, please do not hesitate to reach out to us. We will respond promptly to assist you. Thank you for your patience and understanding throughout this process. Your trust in our cooperation means a lot to us, and we are committed to ensuring a smoother, more transparent experience for you moving forward. Best regards, Shim