I just bought a Dell Inspiron 17R 7720 with Windows 8 that I want to 'downgrade' to Windows 7 Ultimate. I have downloaded the Certs and SLICs but have no idea which .bin file I need to use. I did this a long time ago on my XPS m1730 but I forgot which files I need to copy to the root of the drive. The BIOS SLIC is v2.1. Thank you!