BIOS for ASUS X75VB

Hi every one!
I've wanted to do some changes in bios for performance issues, and found my self cut off my desired settings.
Found threads about modifying bios, did it my self with success (until i got to flashing).
When i flashed the bios it seem to be okay, but after a reboot i was still missing my settings.
To flash i used AFUDOS, AFUWIN didn't flash with an "can't erase old bios" error.
Modified the bios with AMIBCP.

Can any one help, may be i modified it wrong, or used the wrong software to flash?



Best regards,

Nick