Flash custom BIOS on ASUS AMI EFI Firmware

Ousret · October 26, 2014

Hello everyone!

New member here, sorry for my english. I'm french, but i will try to do my best.

Don't hesitate to tell me if something goes wrong.

Since couples of days I'm working on own Asus flash their AMI EFI Firmware.

Well, Some laptop has a vulnerability and flash without verifications when WinFlash give them the ROM.

But WinFlash, of course, check the ROM. So I decided to search when WinFlash check the ROM and forced it to accept the ROM.

It work on some Ivy Bridge ASUS AMI EFI bios for now..

Does not work on Haswell ASUS AMI EFI for now..

Try it and tell me if it work on your laptop or not.

If anyone has any idea in order to extend the compatibility of this trick, don't hesitate.

How to enjoy this method :

* Require *

Laptop with Asus AMI EFI firmware.
Brain.
Some time.

Original WinFlash
Original ROM
Modified ROM

Windows 7 / 8 / 8.1

* How to flash with custom ROM *

1. Download the last revision of your BIOS at Asus website.
2. Download AMIBCP 4.53
3. Modify whatever you want then save as "Modified.REV", ex: (XF750J.208 to MODIFIED.208)
4. Open notepad++ and write some char and let notepad open without saving.
4. Run patched WinFlash and select the untouched BIOS data
5. Clic exit
6. When Windows say that notepad does not allow shutdown, clic on "abord".
7. (Optionnal) If you have USBChargerPlus on your laptop, you should restart it (C:\Program Files x86\Asus\..)
8. Run patched WinFlash again, this time select the modified BIOS data then clic Flash and exit.
9. Your laptop should flash the custom ROM, if not, you'll have to wait.

* !! NOTE !! *
If WinFlash does not recognize your ROM DO NOT TRY TO FLASH YOUR LAPTOP ! Risk of brick.
Don't do it unless you have a SPIFlasher in hand with backup..

* Finally *

Hope this will work for you guy !
Enjoy it !