Alright, I achieved what I want by extracting the body with UEFIExplorer. Edited the string I need with AMIBCP tool.

Then I took unchanged CAP, opened with hex editor and pasted the content of my modified body starting from 800h offset. Saved as a new CAP, named as required and guess what — it flashed via USB Flashback like a charm.

So, it seems that it wasn't able to flash unsigned one, actually.

Hi all,

I am triying to flash my M5A99FX-PRO with modded file. No success. I tried to use Asus AI Suite, it doesn't works. Tried with AFUWin, ... nope (security reasons), tried with BIOS UEFI main menu, neither... security reason. Flashback... LED doesn't starts to blink. File is named as M5A99FX.CAP. It seems ok, but USB flashback proccess doesn't starts (I tried with 3 different pendrives inserted in green USB for flashback). What can I do?
Thanks

@diegolm:
Use RUFUS on an 8GB or smaller USB and format it Fat32 MBR. If they have been used as a GPT drive, Flashback will not work.

Hi again,
I used a 512MB, 4GB and 2GB pendrives with MBR and FAT32 partitions. I tried to format them again with Rufus with same results. No blinking led. I really want to flash it with my modded BIOS but I can't find a way.

Try FAT/FAT32 on smaller USB, port to use is the bottom near Audio output.
Update to the official latest version with Bios FB and get confirmation on the correct operation and USB drive, load CMOS defaults and exit.
Bios FB button pressed 3sec, after 5sec blinking and then off, not good. If OK will keep blinking with increase rating and will shut off after 3 minute or more...DO NOT interrupt operation.
Now u know what drive to use Bios FB with mod.

@MeatWar:
Hi,
I tried many ways to do with same results. Leds no blink. zero blinks at all. I tried 12 different pendrives with FAT and FAT32 with same results. Always in green USB port marked as Flashback port. Zero blinks pushing flashback button. Is mainboard fault maybe?

Good news!
I have flashed my Asus mainboard!! and Now it makes my new NVME disk boots my OpenSuse from it. Thanks to all for your patience, Here's the trick. Solution was not related to pendrive format. This is the way it worked for me.

1 - Format a FAT32 pendrive. No matters if pendrive has files or not.
2 - Copy the modded or original BIOS with correct name.
3 - Deattach any PCI-e cards, VGA also.
4 - Connect pendrive to the Flashback USB port.
5 - Shutdown the computer.
6 - Push Flashback button for 3 or 5 seconds to start blinking.

Point number 3 was the key. After deattach PCI-e VGA card all worked like a charm.

Hope this way can helps many other people with same problem.

Regards.

Good. Thanks.

I procede with it and now I got this error omg. Did I flash something wrong? My lap is still turned on so Please tell me please


even when I try to flash official bios G751JTAS.213 it gives same error

I don't think my laptop support it

so That means I can directly flash moded rom? Did you check when I uploaded it? was it error free?

Sir now I have no doubts but Is my moded rom fine?

but sir

1 ) Copy the original (untouched) BIOS file into the same directory as the file AFUWINx64.exe.
2) Flash the original BIOS by running the following Command Prompt (as Admin):

afuwinx64.exe <NAME OF THE ORIGINAL BIOS>.CAP

how to do it? because my original bios gives error