I deeply apologize for the long wait. I wasn't able to get the motherboard until just recently. I flashed the BIOS with the supplied mod, inserted the cert and using the correct serial for Windows 7 Ultimate 64-bit...IT WORKED!!! It worked perfectly, no problems whatsoever! Windows is fully activated! Don't know if this will help, but I flashed it using the Q-Flash option (I pressed DEL to enter BIOS and then pressed F8 if I am not mistaken. Had the mod in a USB stick and flashed from there). Thanks so much!
-Motherboard Manufacturer and Model : Asus Sabertooth Z77 -Bios Revision : 0906 -Bios Type : EFI -Bios SLIC :ASUS 2.1 -Bios Link : h**p://rghost.ru/37579369 -Rw-everything report.: h**p://rghost.ru/37579352