Question: I currently own an Asus M51AC-FR034S that has an Asus M51AC motherboard.
When I updated the BIOS some time ago I noticed that the BIOS file name was

```
H87M-PRO-ASUS-M51AC-1002.CAP

```

Whereas H87M-PRO's one was

```
H87M-PRO-ASUS-2102.CAP

```

After some search, I noticed that the M51AC motherboard was in fact a rebranded H87M-PRO motherboard, without the 2 eSata ports (just search on Google Images, you'll see that the two are identical).

What I want is to install the latest H87M-PRO BIOS on my motherboard to access the new overclocking features, and to solve [my other question](https://superuser.com/questions/1006933/1600-mhz-ram-detected-as-1333-xmp-doesnt-work) (in the changelog of H87M-PRO BIOS 0713: "2.Fix XMP button issue") Ah. My XMP button doesn't work. This could solve that.
I tried to use Asus EZ Flash, it works with the M51AC BIOS but with the H87M-PRO one it shows an error "couldn't verify security key" or something like that.

Is there a way to force installing the BIOS, or to edit it to make the motherboard think it's a real M51AC BIOS?

Answer: 
There is another way if you want to change the BIOS from the M51AC version to H87M-PRO version. Flash the first release BIOS for M51AC and then replace it with a BIOS for H87M-PRO, flash with the tool from AMI.

**Download:**

* The first release BIOS for M51AC, "[H87M-PRO-ASUS-M51AC-0118.CAP](https://mega.nz/file/aBQD1C4K#h4FV5rAODhWKruNpsAxZn4etcx_0X7n7vonzr1vwEmo)".
* The latest release BIOS for H87M-PRO, "[H87M-PRO-ASUS-2102.CAP](https://mega.nz/file/jAIBDQbB#-w-6XwAAt_JyJL61xvpxfS4N4MsVjj5-5cYoz2NJh6M)".
* The AfuWin64 tool for Aptio 4,"[Aptio\_4\_AMI\_Firmware\_Update\_Utility.zip](https://mega.nz/folder/ucRXzKqB#810xeZ5_NVGcuhzbbf1nHg)"

Use AFUWINGUI.EXE to do the following steps.

**1.** Load H87M-PRO-ASUS-M51AC-0118.CAP.

**2.** Check "Do Not Check ROM ID"

**3.** Flash

Then when that is completed do:

**1.** Load H87M-PRO-ASUS-2102.CAP.

**2.** Check "Do Not Check ROM ID"

**3.** Check "Program All Blocks"  

**Note:** *This will give you an error after  

the tool have erased and flashed "Non Critical Block" part. But it  

will clear up some leftovers from the previous BIOS. You might  

accomplish the same thing by resetting the BIOS through the jumper
on the mainboard.*

**4.** Flash

**5. Reboot**

*(I also flashed the first release BIOS for the H87M-PRO mainboard and it was possible to flash to the latest version through EZ-Flash tool in BIOS options. But that was purely for testing if it would work to do that.)*
It's possible. I do that right now. All you need is a CH341A programmer from Aliexpress and Winbond 25Q128FVIQ chip for BIOS backup "just in case". After that M51AC motherboard is regular H87M-PRO with all OC options. Works fine and stable. Sorry for dig but I tried to find a solution for this problem almost a six months and no one knows.