[Problem] Size of Mod ASUS X510UR BIOS doesn't match

I used AMIBCP to modify the BIOS file, navigating through the desired folders, subfolders, and options, and changed them from ‘default’ to ‘user’. After saving the file (without creating a new one), I received a warning that the BIOS was not signed. I noticed that the size of the backup file created by AFUWIN is smaller than the saved file.

When I tried flashing using AFUWIN, an error occurred indicating that the file size was not as expected, so I decided not to proceed. What would be the best procedure in this case?

Information:
Version: 310
System: Windows Hirenboot


Edit by Fernando: Thread title shortened and customized

3 posts were merged into an existing topic: [Request] BIOS mod X510URR