For most customers, visiting a professional repair provider with certified technicians who use genuine Apple parts is the safest and most reliable way to get a repair. These providers include Apple and Apple Authorised Service Providers, and Independent Repair Providers, who have access to genuine Apple parts.* Repairs performed by untrained individuals using non-genuine parts may affect the safety and functionality of the device. Genuine Apple parts are designed to fit precisely within the device. Also, repairs that don't replace screws or cowlings correctly may leave behind loose parts that could damage the battery, cause overheating or result in injury.