Zitat von jcorrea im Beitrag #4

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@Sylar76
Warning!!!
This is just what I did to change some of images on my UEFI. Please, if you are not sure what you are doing or even you don't know how to recover you motherboard from a bricked bios, don't try this.
I'm not responsible for a damaged motherboard, thermonuclear war or whatever other problem you get following these instructions.

You have to locate which uefi modules have images and then, replace by your images.

I did a script to extract images, it uses UefiExtract (thanks to CodeRush), cause it create folders with GUID as name and it helps a lot the task of locate and replace the files. (thanks to lordkag, that creates the huge amount of code of my script :D)
extractUefiImage

All you have to do is put the script files on the same folder of UefiExtract and UefiFind (from UBU Tool), and drop your uefi rom over the "extractUefiImage.bat". After some time, the extraction will be complete and you will have a new folder called "yourRomName.ext.dump" with the extracted images.

In ASRock Uefi, images normally have a header with 4 bytes, 3 of them represents the filesize and 1 is a separator (I don't know how is the Asus header).

Example of image without the ASRock header:


We need to check the filesize to add it to the header:


But, before we calculate this on hexadecimal to put to header, we need to add 4 bytes (the header) to filesize (75989 + 4 = 75993) and them, calculate:


After we obtain the filesize converted to hexadecimal, we have to include this to the file header, but from right to left. As we obtained 128D9, we put in the header D9 28 01. The last ("19") is the separator:


After this, we need to use UefiTool (thanks to CodeRush again) to locate the GUID where is the file that we want to replace:


After locate the GUID, we need to navigate to the "path" as the path we get after extract the files. In this case is "68BA3E2A-9992-47E6-A087-1C2CC9874CA5 -> Compressed Section -> Raw Section":


Then right click in it, and select "Replace as is":


Then, select the new image with the new header and save the uefi and, flash it.

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