hello i bought 2 laptops off CL -one of which was a 15" 2012 macbook pro retina. When i turned it on, it booted to the icloud page requesting the pin. then booting with the option key pressed required the efi pass i thought maybe by formatting the drive and cloning another i can bypass that. so i got an external flash drive enlcosure, connected to another laptop and repartitioned and cloned the drive. now when i boot i get the ? folder. i also bought the teensy kit, but i dont know how to use. any suggestions i would really appreciate.