Rici4

guys i have gt70 2od gaming laptop with 780m a wanted to try vbios but i dont know why when i flashed it with no problems, my 780m change to something like unknown device so its not working i know that i can roll back to original bios but i would like to know why because everywhere i looked it was said that it should work without problems if 780m is my original card so where is the problem? i also know that i could mod inf files but im kinda lazy and this sould work without problems. Could it be because i flashed it in Windows should I try it in DOS through USB? My bios is updated to latest one, so maybe that could be problem or maybe something with optimus because i red somewhere that optimus works through igpu?