How to Install a BIOS Update on Your ASUS Motherboard

The basic process: read, prepare, and flash

Installing a BIOS update on an ASUS motherboard involves downloading the correct file from ASUS, preparing a USB drive, and running the update from your computer's startup screen. The whole process takes 10 to 20 minutes, though you should plan for an hour to be safe. The update itself happens before Windows loads, so you cannot do it from within your operating system.

ASUS provides a tool called ASUS EZ Flash that handles most of the work for you. It lives in your BIOS menu and can read the update file directly from a USB drive. You do not need special software or technical knowledge beyond following the steps in order.

The most common mistake is downloading the wrong file. ASUS motherboards have different model numbers, and a file for one will not work on another. Flashing the wrong file can leave your motherboard unable to start, so matching the model number exactly is not optional.

Key Takeaways

Find your exact motherboard model in Windows (search "System Information") or on the physical board itself, then read the matching BIOS file from ASUS's support page.
Format a USB drive to FAT32, copy the BIOS file to the root folder, and restart your computer.
Enter the BIOS menu during startup (usually by pressing Delete or F2), find the EZ Flash tool, and select your USB drive to begin the update.
Do not turn off your computer or unplug the power during the update; the process is automatic and takes a few minutes.
Your computer will restart automatically when the update finishes, and you can delete the BIOS file from the USB drive afterward.

Finding your motherboard model and the correct BIOS file

Open Windows and press the Windows key, then type "System Information" and press Enter. Look for the line labeled "BaseBoard Product" — that is your motherboard model. Write it down exactly as it appears, including any letters or numbers after the main name.

Go to the ASUS support website and search for your motherboard model in the search box at the top. Click on your model when it appears, then look for a tab labeled "Support" or "Downloads". You should see a section for BIOS or Firmware. read the latest version — ASUS lists them with dates, and the newest one is at the top.

Save the file to a location you can find easily, like your Desktop. The file will have a name like "Z790-E.CAP" or similar. Do not rename it or change the file extension.

Preparing your USB drive

Plug in a USB drive that you do not need for anything else. It should be at least 1 GB, though most are larger. Right-click on the drive in File Explorer, select "Format", and choose FAT32 from the dropdown menu. Click "Start" and confirm the warning. This erases everything on the drive, so make sure you have backed up any files you need.

Once the format finishes, copy the BIOS file you downloaded to the root folder of the USB drive. The root folder is the main level — do not put it in a subfolder. You should see the file when you open the drive in File Explorer.

Safely eject the USB drive by right-clicking it in File Explorer and selecting "Eject". Leave it plugged in.

Entering the BIOS menu and starting the update

Restart your computer. As soon as it starts to boot, press Delete or F2 repeatedly (check your motherboard manual or the startup screen for the correct key — different ASUS models use different keys). You should see the BIOS menu appear before Windows loads. If Windows starts instead, restart and try again, pressing the key faster.

Once you are in the BIOS menu, look for a tool called EZ Flash, ASUS EZ Flash Utility, or when ready Flash. The exact name depends on your motherboard, but it will be in the main menu. Select it and press Enter.

The tool will scan for USB drives. When it finds yours, select it and press Enter. You should see the BIOS file you copied earlier. Select it and press Enter to begin the update.

What happens during the update

The update will show a progress bar and take between 2 and 5 minutes. Your screen may go black or show a spinning icon — this is normal. Do not turn off your computer, unplug the power, or press any keys. If the power goes out during an update, your motherboard may not start again.

When the update finishes, your computer will restart automatically. You may see the BIOS menu again briefly, or Windows may load normally. Both are fine. Let the computer finish starting up completely.

After the update is complete

Once Windows has loaded, you can remove the USB drive and delete the BIOS file from it. The update is permanent — you do not need to keep the file.

Some users notice their BIOS settings have reset to defaults after an update. If this happens, you may need to adjust settings like boot order or RAM speed again. Check your motherboard manual for the settings you had before, or leave them at defaults if you are unsure.

If your computer does not start after the update, or if you see error messages, check the ASUS support page for your model. Some motherboards have a recovery process if something goes wrong, and ASUS provides instructions for that specific model.

When to update and when to skip it

ASUS releases BIOS updates for three reasons: to fix bugs, to support new processors, or to improve stability. If your computer is working well and you are not planning to upgrade your processor, you do not need to update. A stable system is better than a new BIOS version.

Update if you are installing a newer processor that your current BIOS does not recognize, if you are experiencing crashes or freezing that the update notes say they fixed, or if you are having trouble with a specific piece of hardware. Read the update notes on the ASUS support page to see what changed.

Do not update just because a new version is available. BIOS updates carry a small risk if something interrupts them, so only update when you have a reason to.

Frequently Asked Questions

What if I cannot find the BIOS menu key for my motherboard?

Watch the screen during startup — most ASUS boards display the key in the bottom right corner, usually "Delete" or "F2". If you miss it, restart and watch again. Your motherboard manual also lists the key. If you have the physical board in front of you, the key is often printed on the board itself near the power connector.

Can I update the BIOS from Windows instead of the startup menu?

Some ASUS motherboards have a tool called ASUS Update that runs from Windows, but EZ Flash from the BIOS menu is more reliable. If you want to try the Windows version, read it from the same support page as the BIOS file. The process is simpler, but if something interrupts it, you have less protection than the BIOS method.

What does it mean if the update fails or gets stuck?

If the progress bar stops moving for more than 10 minutes, your power may have failed or the USB drive disconnected. Do not restart — wait 15 minutes to be sure. If nothing changes, you may need to use ASUS's recovery process. Check the support page for your specific model; many boards have a backup BIOS chip that can restore the system.

Do I need to unplug everything before updating the BIOS?

You do not need to unplug your monitor, keyboard, or mouse. You should unplug external drives, printers, and other USB devices to reduce the chance of interference. Keep the power cable plugged in — losing power during an update is the main risk.

Will updating the BIOS delete my files or Windows?

No. The BIOS update only changes the firmware on your motherboard. Your hard drive, Windows installation, and all your files remain untouched. The update happens before Windows even loads.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.