MSI 280X Voltage Locked - Help Please

hi guys

I purchased an MSI 280X Gaming OC GFX and would like to undervolt it

I read on forums to try this bios: techpowerup.com/vgabios/146769/msi-r9280x-3072-131009.html

which i did with ATIflash in DOS, i switched to position 2 on the small switch (s...