RepairCal

RepairCal is an internal utility used by Apple and other Apple Authorized Service Providers (AASPs) to calibrate the display units and batteries of new iPhones, as well as recalibrate displays and batteries of newly repaired iPhones. It flashes Horizon Firmware to the device, which is responsible for helping to recalibrate the screen and battery. RepairCal is not to be confused with DisplayCal or 3DTouchCal.