How to Reflash BIOS [Step-By-Step]

If your computer is experiencing boot problems, random crashes, hardware compatibility issues, or you’ve been instructed by your PC or motherboard manufacturer to update the firmware, learning how to reflash the BIOS can help. Reflashing the BIOS (Basic Input/Output System) replaces the existing firmware on your motherboard with a newer or restored version. This process can fix bugs, improve hardware support, and enhance system stability.

In this guide, you’ll learn how to reflash the BIOS step by step using easy instructions.

What Does Reflashing BIOS Mean?

Reflashing BIOS means replacing the firmware stored on your motherboard’s BIOS chip with a fresh version. The firmware is responsible for initializing your processor, memory, storage drives, graphics card, and other hardware before Windows starts.

Manufacturers release updated BIOS versions to fix software bugs, improve compatibility with newer CPUs and RAM, enhance system security, and sometimes improve overall performance. If your BIOS becomes corrupted because of a failed update or power interruption, reflashing may restore your computer to working condition.

Unlike updating Windows drivers or installing software, reflashing changes firmware stored directly on the motherboard. That is why following the correct procedure is extremely important.

How to Reflash BIOS [Step By Step]

Every motherboard manufacturer has its own BIOS flashing utility, but the overall process is very similar. Whether you’re using ASUS EZ Flash, MSI M Flash, Gigabyte Q Flash, ASRock Instant Flash, Dell BIOS Flash Update, HP BIOS Update Utility, or Lenovo BIOS Update, the basic steps remain nearly the same.

Follow each step carefully and never interrupt the flashing process. Taking a few extra minutes to prepare properly can prevent serious problems later.

Step 1: Identify Your Computer or Motherboard Model

Before downloading anything, you need to know exactly which motherboard or laptop you have. Installing the wrong BIOS version can make your system unusable.

If you’re using a desktop computer with a custom-built motherboard, press Windows + R, type msinfo32, and press Enter. The System Information window displays details such as the motherboard manufacturer, BIOS version, and system model. You can also check the motherboard itself for its model number.

For laptops, the easiest method is checking the label on the bottom of the device or viewing the system model in System Information. Make sure you write down the complete model number because manufacturers often release different BIOS files for similar models.

Step 2: Download the Correct BIOS Firmware

Once you know your exact model, visit your manufacturer’s support page and locate the BIOS download section.

Compare your current BIOS version with the latest version available. If your BIOS is already up to date and your computer is working properly, you usually do not need to reflash it unless you’re recovering from corruption or following official troubleshooting instructions.

Download only the BIOS designed specifically for your motherboard revision or laptop model. Many manufacturers also include a Read Me file with installation instructions, supported hardware, and important warnings. Spend a few minutes reading those instructions before continuing.

Step 3: Prepare a USB Flash Drive

Most modern motherboards use a USB flash drive for BIOS updates.

Insert a USB drive into your computer and format it using the FAT32 file system. This format is widely recognized by BIOS flashing utilities.

Copy the downloaded BIOS file onto the USB drive. Some manufacturers require the BIOS file to be renamed before the update. Others may provide a utility that automatically prepares the USB drive. Follow the manufacturer’s instructions if this step applies to your system.

After copying the files, safely remove the USB drive.

Step 4: Connect Your Computer to Reliable Power

A BIOS update should never be interrupted.

If you’re using a desktop PC, connect it to a reliable power source. If available, using a UPS provides extra protection against unexpected power outages.

For laptops, plug in the AC adapter and make sure the battery has a healthy charge. Most laptop manufacturers recommend keeping the charger connected throughout the entire BIOS update.

Avoid performing the update during storms or when your electrical supply is unstable.

Step 5: Enter the BIOS Setup Utility

Restart your computer with the prepared USB drive connected.

During startup, repeatedly press the BIOS access key. Depending on your manufacturer, this may be Delete, F2, F10, F12, or Esc.

Once inside the BIOS, locate the firmware update utility. Different manufacturers use different names, but you’ll typically find it under the Advanced, Tool, or Update menu.

Take your time navigating through the BIOS menus. The update utility is usually easy to find.

Step 6: Start the BIOS Reflash Process

Open the BIOS update utility and choose the option to update using the USB drive.

Browse to the BIOS file you copied earlier and select it. The utility will verify that the file matches your motherboard.

Review the information shown on the screen, including the current BIOS version and the new version you’re about to install. If everything looks correct, confirm the update.

The flashing process may take several minutes depending on your hardware. During this time, do not restart your computer, press any keys, or disconnect the power.

Step 7: Wait for the BIOS Flash to Finish

The progress bar may pause occasionally during the update. This is completely normal.

Once the flashing process is complete, your computer will restart automatically or prompt you to reboot.

Some systems restart several times before the update finishes. Allow the process to finish without interrupting it.

Step 8: Load Default BIOS Settings

After the computer starts again, enter the BIOS setup one more time.

Many manufacturers recommend loading the Default or Optimized Default settings after a BIOS update. This ensures the new firmware starts with stable configuration values.

Save the settings and restart your computer. If you previously customized settings such as XMP, boot order, virtualization, or fan profiles, you can now reapply them.

Step 9: Verify That the BIOS Update Was Successful

After Windows loads, open System Information again by typing msinfo32 in the Run dialog.

Check the displayed BIOS version and confirm it matches the version you installed.

Test your computer for several minutes to ensure everything is working normally. Verify that USB ports, storage drives, memory, networking, and other hardware devices function correctly.

If the update was intended to resolve a specific issue, check whether the problem has been fixed.

FAQs

Is reflashing BIOS the same as updating BIOS?

Yes. Reflashing BIOS and updating BIOS generally refer to installing new firmware onto the motherboard. The term “reflash” is also commonly used when reinstalling the same BIOS version to recover from firmware corruption.

Can reflashing BIOS fix a corrupted BIOS?

Yes. Many modern motherboards support BIOS recovery or BIOS flashback features that can restore corrupted firmware without replacing the motherboard. The exact recovery method depends on your manufacturer.

Can I reflash BIOS without entering Windows?

Yes. Most current motherboards include a built-in BIOS flashing utility that works directly from the BIOS setup using a USB flash drive. Some systems even support BIOS Flashback, allowing firmware updates without a CPU or installed operating system.

What happens if the BIOS update is interrupted?

If power is lost or the flashing process is interrupted, the BIOS may become corrupted, preventing the computer from booting. Some motherboards include recovery features, while others may require professional repair or BIOS chip replacement.

How long does reflashing BIOS take?

Most BIOS updates finish within 5 to 15 minutes, although the exact time depends on the motherboard and firmware size.

Should I update my BIOS regularly?

Not necessarily. If your computer is stable and you’re not adding new hardware or addressing a specific issue, updating the BIOS is usually unnecessary. BIOS updates should generally be performed when they provide a clear benefit or are recommended by the manufacturer.

Summary

Knowing how to reflash BIOS can help you recover from firmware issues, improve hardware compatibility, and keep your computer running reliably. The process is straightforward when you identify your exact motherboard model, download the correct BIOS firmware, prepare a FAT32 USB drive, use the built-in BIOS flashing utility, and avoid interrupting the update.

Always verify that you’re using the correct BIOS file for your specific system, keep your computer connected to reliable power, and allow the flashing process to complete without interference.