How to Reflash and Replace Your Computer BIOS

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BIOS is short for basic input-output system. It is a set of electronic instructions stored on a chip inside your desktop or laptop. These instructions tell the computer how to perform the POST (power on self test) and allow rudimentary management of certain hardware components. The most popular method used to reflash the BIOS used to be a floppy disk. Because of the slow demise of the floppy disk drive, the current method is to either use a bootable CD or a self-contained BIOS flashing executable such as WinFlash.

Method 1
Method 1 of 4:

Prepping the BIOS

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    Read any instructions that come with the executable. Most executables will run fine whether they are loaded onto a floppy or a CD. The instructions will let you know if a floppy isn’t the recommended method.
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Method 2
Method 2 of 4:

Using a Floppy Disk

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    Format it by right-clicking on the drive in My Computer and selecting the Format. Check the box that will make the newly formatted disk bootable.
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    It should reflash the BIOS automatically, with very little interaction required from the user.
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Method 3
Method 3 of 4:

Using a Bootable CD

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    Some computer manufacturers will provide a bootable BIOS update ISO that can simply be burned onto a CD. Download the ISO from the manufacturer website.
    • Use a CD burning program that is compatible with ISO files to burn the bootable ISO to a CD.
    • Boot to this CD, and allow the BIOS update to proceed automatically. Usually there is minimal user input required.
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    Some computer manufactures will provide a BIOS update executable file, and leave it up to you to create a bootable CD image that includes this file. There are many CD burning programs that support creating a bootable CD.
    • Download the BIOS update file from the manufacturers' website.
    • Use the CD burning program of your choice to create a bootable CD. Make sure that you add the BIOS update file to the image that you are creating.
    • You can find the files required to make a bootable CD with a simple search engine query like “create bootable CD”.Once you have created and burned your image, boot to the CD.
    • Run the executable file, and allow the BIOS flashing process to complete.
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Method 4
Method 4 of 4:

Using WinFlash

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    • This method is gaining popularity with computer manufacturers, because it reduces the possibility of user error. You can find out if this option is available to you by logging onto the manufacturers' website and searching for a BIOS update using the exact model of your computer. It is the fastest and easiest way to update your BIOS.
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    Make sure that you are downloading the executable for your precise computer model. Save the executable somewhere easily to find, like your desktop.
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    Do not reboot your computer until requested by the utility. It may simply reboot the computer itself.
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Expert Q&A

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  • Question
    Is it safe to update the BIOS in Windows?
    Mobile Kangaroo
    Computer & Phone Repair Specialists
    Mobile Kangaroo is a full service repair shop and Apple Authorized Service Provider headquartered in Mountain View, CA. Mobile Kangaroo has been repairing electronic devices such as computers, phones, and tablets, for over 19 years, with locations in over 20 cities.
    Mobile Kangaroo
    Computer & Phone Repair Specialists
    Expert Answer
    It is generally safe as long as you source the BIOS update directly from the device manufacturer and follow their instructions carefully.
    Thanks! We're glad this was helpful.
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  • Question
    Is it possible to reflash the BIOS with the correct version using a second computer?
    Community Answer
    It should be; consult your manufacturer support and they will talk you through it. If you know how to flash it, put the new files onto a clean USB key and insert it into your computer.
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  • Question
    How do I create a bootable usb?
    Community Answer
    Format a USB key and put the files onto the key. You can also use a program that puts the files onto the key and makes it bootable. One program that works is Rufus.
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      Tips

      • BIOS updates can be found on the manufacturer website. The description of the update on the manufacturers' website will explain the benefits of the BIOS update, or any problems the update may cause. You can also find manufacturer-specific BIOS flashing instructions.
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      • You can access the BIOS by pressing a certain key prior to the Windows flash screen, usually F2, DEL or ESC.
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      • Once the computer has been rebooted, your BIOS update is complete. Most computers will flash the BIOS version during the computer boot process. If you missed it, you can always enter the BIOS and check the BIOS version there.
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      Warnings

      • Make sure that you reflash the BIOS with the exact BIOS needed for your computer model. Flashing with an incorrect BIOS update can make your desktop or laptop a completely useless machine.
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      • Unless you have a specific problem with the BIOS, don’t reflash it.
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