Hello everybody,

I have a problem with my Asus laptop. While installing a new OS from USB the laptop got stuck while accidently starting from an empty drive instead of the Installation-Stick. Now the laptop will startup, the fans run, but the screen stays black. I don't even manage to get into the BIOS. Somehow it is bricked.

So i took it apart, ordered a CH341A USB stick to flash a new BIOS on the mainboard. It has not yet arrived, so i will have to wait until it does. Then I can hopefully get the information about UUID and serial number.


I have downloaded a new BIOS from the Asus website, but the file format is not a CAP, not a BIN and not a ROM. The file i get from the website is named: "X55CRAS.408".

So i can't open it with UEFITools. When renaming the file to .cap i can open it, but it is not like a Bios file should look like. There is no line that says "AMI Capsule Header", but a lot more lines I can't understand.

When opening the file with FD44Editor to edit the UUID and serial number, i get " Fatal error : Error parsing BIOS data. $BOOTEFI$ signature not found. Please open correct ASUS BIOS file."

1. How do i get a correct CAP-File from the X55CRAS.408-File to work with?

Any help would be appreciated!

Hello Fernando, thank you for the quick and helpful response! I just tried it and it works. i was able to save a bin file.

My programmer is delivered tomorrow. Then I will backup the chip information from my motherboard and merge it with the bios image from the Asus website with HxD program.
Hopefully it will work when I write the new data on the chip.
Now my question is this: When I copy the first part of my backup image and paste it into the new asus image with the hexeditor, do I have the original serial number, mac address?
Or do I have to find it in the imagefile and copy it separately?

Best Regards

Ok, I managed to get a dumpfile from the old BIOS. Can somebody please combine the new Biosimage with the dumpfile to generate a flashable BIOS??

Thank you!