Thực ra thì mình ở mình cung it ai dùng tới cáI này.
Bạn tham khảo bài này nhé.
Usually You have
two BIOS positions on your card: (switch)
Switch!

#1: Unlock BIOS (You can flash this one)
#2: Lock BIOS (This is the default BIOS you can't flash)
It is important to save the BIOS #1 even if you have two BIOSes (BIOS can have different clock state)
How to save a Backup of your BIOS using GPU-Z!
Now
first step is to download
ATIwinflash
Then extract it on your Computer and insert the BIOS you want to use in that folder like this : (In this Case, the wanted BIOS is 7970XFX.
rom ) (Bios collection Link at the end of the post)
It is also important to take note of the
LOCATION of ATIwinflash.exe for further use
Now go in start menu and write cmd.exe in search and open command prompt (cmd.exe) with right-click and "Run as Administrator
How to open Command Prompt
Once open, write the location of ATIwinflash with CD before the command (Since ATIWinflash is on my D:, I need to write D: then enter first, as shown here)
Then enter will give you this window
Now, write this command :
atiwinflash -f -p 0 "NAME of the BIOS".rom then enter. In my case its
atiwinflash -f -p 0 7970XFX.rom
Then enter and the Flash Will proceed
When complete it will show a windows like this one and will ask you to reboot. (Do it unless you have more than one card to flash)
Crossfire Cards
So the "
0" in "
Atiwinflash -f -p 0 7970XFX.rom " meant the first Card
0 : First PCIe Slot
1: Second PCIe Slot
2: Third PCIe Slot
3: Forth PCIe Slot
So if you have 4 Cards you will have to enter those commands (No need to reboot between each flash, but very important to reboot at the end of the last flashed card)
atiwinflash -f -p 0 7970XFX.rom
atiwinflash -f -p 1 7970XFX.rom
atiwinflash -f -p 2 7970XFX.rom
atiwinflash -f -p 3 7970XFX.rom
DONE
overclock