MSI GT70 GTX 670MX overclock problem with flashing VBios

[CTszkacper]

I have used Kepler Bios Tweaker to modify my original vbios, but i can't flash it with NVflash. I was trying various versions of NVflash, but all of them are not working in DOS nor in Windows. The only version that worked in DOS is 4.41, but it's so old that it can't detect my graphics card. Please help me finding solution and overclocking my graphics :)