The safety and longevity of your product depend on proper repair and maintenance. Please operate strictly in accordance with the repair instructions and use official spare parts to repair the equipment. Using non - official spare parts or operating in an improper manner may cause equipment damage or safety risks. If you still have any questions after watching tutorial video, Please contact us for further assistance from our qualified technicians. Any product failure, defect and/or damage resulting from unauthorized repairs and/or maintenance will not be covered by our Limited Warranty and are at your own risk and cost.