You will need to download the BIOS installation software for DOS if they have one from the motherboard manufacturer and the BIOS file. You will then need to make a bootable dos cd-r disc using windows. Once you have done this you can use the disc to start your computer in DOS mode. Then burn the BIOS DOS SOFTWARE and the BIOS FILE on a cd-r. Then you will be able to run the BIOS software from dos and install the bios file. You could also install windows on a USB hard drive then try to boot from it if your computer can boot from USB and the USB boot device option is still working.
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