How to Retrieve a Previous BIOS Version
Motherboard manufacturers periodically release updates to their basic input/output systems, which can cause problems if the updates introduce bugs to the system. If you have recently updated your BIOS and are now experiencing problems with the normal operating of your computer, retrieve the previous version of your computer's bios and re-flash it to the chip. Try this method in conjunction with clearing the complementary metal-oxide semiconductor (CMOS), which will restore the BIOS settings to the factory defaults.
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Instructions
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Obtain the bios update file previous to the one currently installed and the bios flash utility from your motherboard manufacturer's website.
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Run the flash utility and load the update file.
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Click the "Flash" button, then shut down your computer.
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Remove all cables connected to your computer and switch off the power supply. Open the computer case.
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Ground yourself by touching the metal case of the computer or wearing an anti-static wrist band.
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Locate the pins labeled "CMOS" and touch them simultaneously with a screwdriver.
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Replace the panel of the computer case. Replace all cables, switch on the power supply and turn on the computer.
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Reconfigure BIOS settings as desired and start the boot sequence.
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