Ok. I will test in the spare time, and report back.
Thank you.

i used the stock efiflash 0.80 from a zipped GA bios and flashed both main and backup bios.
with the following command "efiflash bios.xxx /DB /X"
In my case i just wanted to downgrade the backup bios and this did the trick.Bear in mind that i flashed a stock bios not a modded one.

I didn't know efiflash can do that so thanks for the info :)

Do you think this would help to flash my bricked MAIN BIOS of my GA-AB350 Gaming 3? I tried everything. I'm on the backup right now.

@Krist0fh - Yes, use stock flash tool and above command. Ahh yes, so you can use hotkey below info, or ignore I just grabbed BIOS F51b (wow, they made a LOT of BIOS for this model, most I've ever seen!)
Anyway, in it's help text >>
Switch options for Efiflash.exe:
/C - Clear DMI data. (default: Keep DMI data)
/S - Save Original BIOS Image to Disk
/R - Reboot System after BIOS Update
/DB- Update both main & backup BIOS

So, boot to DOS and run EFIFlash.exe filename.f51b /DB
DualEFI will help you switch BIOS, I think, maybe, if we can get it for you

That, or try PS/2 Keyboard and Hotkey combo to flash backup to MAIN (BE SURE, you flash BACKUP to MAIN, it will ask you if you want to proceed before it does anything)
Sometimes it takes a try or three before you time it just right. It needs to be done at bootup, where you'd normally hit DEL to enter BIOS. Spam hotkey combo, if you get boot menu, reboot and try again until you get it.
I explain more here about this - Gigabyte GA-Z97X-UD5H-BK BIOS upgrade (3)

Or, you can also try DuelEFI mentioned one post below the linked post above (#35)
I will PM @thinking now to see if he will still send me the tool, if he sent already I must have lost it?
If you have, and can send, attach zip here renamed .txt, maybe that is OK with your firewall?

Oh thanks. I will try my best. I might get lost because I don't really understand so well some things. I might need a tutorial for 5 years old.

@Krist0fh - If you don't know how to make DOS Bootable USB, you can google Bootable DOS USB Rufus and you should find guide to make. Then copy efiflash + BIOS onto USB, then run command I gave above.
Or, you can follow step #1-2 ONLY here, then copy also EFIFlash + BIOS onto USB (USB may look blank to you after #1-2, this is OK) - <Request> Flagship X470 Gaming 7 Wifi Motherboard BIOS Fix
To boot to DOS >> at startup, hit F12 to get to boot menu, there choose USB (not UEFI USB). Or, from BIOS Exit page, go to Boot Override and choose your DOS USB (not UEFI one)

Thanks for creating and sharing this tool. This is the problem that I'm having since trying to flash a std BIOS for my z390 Master motherboard since I used a Gigabytes own modified one which included basic RGB lighting control. I now just get OEM Mismatch errors on both the QFlash and the EFI Flash.

So this was linked in another forum and I then found this site to read about the .80 version and what it is able to do. But for me I still get the OEM Mismatch issues when trying to flash back a std Gigabyte Z390 Master BIOS.....

**** sorry can't post a link to show that DOS error with the 0.80 tool showing the OEM Mismatch error ****

this is using the 0.80 version of this tool which is supposed to resolve that issue...?

Any help please...?

All worked fine, with great help, using the 0.85 version of this tool.

@Vimes - Great you got it sorted! Yes, they linked you to the wrong thread, you needed this thread for the mod version

Zitat von Lost_N_BIOS im Beitrag #39

---

@Vimes - Great you got it sorted! Yes, they linked you to the wrong thread, you needed this thread for the mod version

---

@Vimes - You're welcome! Any time you have BIOS issues, or need something edited, let me know, I can usually help

Updated the OP to include EFIflash v0.85 as it may be required for newer BIOS/motherboard.

Sorry to bother you again but, does it matter if I'm in the F25? Should I go in order before jumping to the last one?

@Krist0fh - Per all the warnings on that BIOS download page, if none apply to your CPU, and you already updated to latest AMD Chipset drivers, then it should be OK to directly update from 25 to 51 using EFIFlash (If you already updated EC FW as noted below)
However, if using Qflash you would need to update to F31 first via EFIFlash or @BIOS, sounds like Qflash update.

Also, at F40, be sure you note this and do before F51 too >> 2. Before update BIOS to F40, you have to install EC FW Update Tool (B19.0606.1 or later version) to avoid 4DIMM DDR compatibility on 3rd Gen AMD Ryzen™ CPU

So, if I was you, to avoid any possible issues, I would update to latest AMD chipset driver, then install the EC FW Update too, then flash to F31, then F40, then F51

@Lost_N_BIOS
I'm very sorry, I haven't come to the forum for several days.
See your message,I came to this thread as soon as possible.
I remember in this thread([HELP] Gigabyte MD71-HB0 : Onboard LAN MAC Adresses wiped (00:00:00:00:00:00)...How to solve?), our friend Nozay33 solved the problem with eeupdate 5.3, and he uploaded the file on the #15 floor.