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YOu can boot to DOS on USB Or CD, up to you.
The file I sent you is a zip, unzip it and you will have the modified rom file. Then unzip what I sent you in PM, and you have flashing programs, you can try the windows versions. First try them all and see which you can make a backup with, if you find one then you can use that one to flash probably. Command to flash is above for DOS version, for windows check the box for "Program Main BIOS" "Program Boot Block" and "Program all non-critical blocks and ROM Holes" rest leave unchecked