ROM BIOS files live in three places: your motherboard manufacturer's website, your computer maker's support page, or specialist firmware repositories

The easiest route depends on what kind of computer you have. If you built your own PC, go to your motherboard manufacturer — ASUS, MSI, Gigabyte, ASRock, or whoever made the board. If you bought a pre-built computer from Dell, HP, Lenovo, or another brand, start with their support site instead, because they sometimes modify the BIOS before shipping. If you have a very old machine or a specialty system, you may need a firmware archive site.

The file you download will be named something like BIOS_E16_1.20.zip or F14d.exe — the exact format varies by manufacturer. You will also need to know your exact motherboard model or computer model number before you search, because downloading the wrong BIOS file can make your computer unbootable.

Key Takeaways

  • Motherboard makers like ASUS and MSI post BIOS files in a support or downloads section organized by board model.
  • Computer makers like Dell and HP post BIOS files under your specific computer model number, which you can find in System Information or on a sticker on the machine itself.
  • You need the exact model number of your motherboard or computer before downloading, because the wrong BIOS file can prevent your computer from starting.
  • BIOS files are usually compressed in a .zip folder and come with instructions for installation, which often requires a USB drive or a restart into a special update mode.

Finding BIOS on a motherboard manufacturer's website

If you know your motherboard brand and model, this is the fastest route. Go to the manufacturer's main website — asus.com, msi.com, gigabyte.com, or asrock.com — and look for a Support or Downloads section. You will usually see a search box where you can type your motherboard model number.

Your motherboard model is printed on the board itself, usually near the CPU socket or along an edge. You can also find it in Windows by opening System Information (press Windows key + R, type msinfo32, and press Enter), then looking for "BaseBoard Product" in the list. Once you enter the model number on the manufacturer's site, you will see a downloads page with BIOS files listed by version number and release date.

Download the latest stable version unless you have a specific reason not to — manufacturers release new BIOS versions to fix bugs or add support for newer CPUs. The file will usually be a .zip folder containing the BIOS file itself plus a readme with installation steps.

Finding BIOS on a computer maker's support page

If you bought a complete computer from Dell, HP, Lenovo, Acer, or a similar brand, go to their support website and search by your computer's model number or service tag. This number is usually on a sticker on the back or bottom of the machine, or you can find it in System Information under "System Model."

Once you enter the model number, the support site will show you drivers and BIOS updates specific to that machine. Download the BIOS file from the Drivers or System Firmware section. Computer makers sometimes customize BIOS files for their hardware configuration, so using the manufacturer's version is safer than downloading from the motherboard maker's site.

Pre-built computers often have their own update tools — Dell uses Dell Command Update, HP uses HP Support Assistant, and Lenovo uses Lenovo Vantage. These tools can sometimes download and install BIOS updates automatically, which is simpler than doing it manually.

Using firmware archive sites for older or specialty machines

If your computer is very old, discontinued, or from a specialty manufacturer, the original support page may no longer exist. Sites like WinFlash, BIOSmaster, and the Internet Archive's Wayback Machine sometimes have archived BIOS files, but use these only if the manufacturer's site is genuinely unavailable.

Before downloading from an archive site, verify the file against any checksum or hash provided — this is a string of letters and numbers that confirms the file has not been altered. If no checksum is listed, contact the manufacturer's support email to ask whether they can provide the file directly. Downloading a corrupted or modified BIOS file is one of the few ways to permanently damage a computer's firmware.

What to do if you cannot find your exact model

If your motherboard or computer model does not appear in search results, try searching for a slightly different version number — manufacturers sometimes list similar models under one page. For example, ASUS might list BIOS for the ROG STRIX B550-F and B550-F Gaming under the same downloads page.

If that does not work, contact the manufacturer's support team directly with your model number and serial number. They can confirm whether a BIOS update exists for your machine and send you the file if it is not publicly listed. This is especially common for business or enterprise computers, which sometimes have limited public BIOS availability.

Checking the BIOS version you currently have

Before downloading a new BIOS file, check what version is currently installed on your computer. Restart your computer and enter the BIOS setup screen — usually by pressing Delete, F2, or F12 during startup, depending on your motherboard or computer maker. The version number will appear on the first screen, usually labeled "BIOS Version" or "System BIOS Version."

Write down this version number, then compare it to the latest version on the manufacturer's website. If your current version is already the latest, you do not need to download anything. If a newer version is available and addresses a problem you are experiencing, download it and follow the installation instructions in the readme file.

Understanding BIOS file formats and what comes in the download

BIOS files come in different formats depending on the manufacturer. ASUS and Gigabyte often use .zip files containing a .bin or .rom file plus a readme. MSI sometimes uses .exe installers that run on Windows. ASRock may provide .zip files or a utility program.

When you download a BIOS file, you will usually get a folder with at least three things: the BIOS file itself (with a name like E16.bin), a readme or instruction file explaining how to install it, and sometimes a utility program for flashing the BIOS. Read the readme first — installation methods vary, and using the wrong method can fail or corrupt the update.

Most modern BIOS updates can be installed from within the BIOS setup screen itself, which is the safest method. Some older systems require you to copy the BIOS file to a USB drive and boot from it. A few systems use a Windows utility that restarts your computer during the update. The readme will tell you which method applies to your machine.

Frequently Asked Questions

What if I do not know my motherboard or computer model number?

Open System Information in Windows (Windows key + R, type msinfo32, press Enter). Look for "BaseBoard Product" for motherboard model or "System Model" for computer model. You can also restart and enter the BIOS setup screen (usually Delete or F2 during startup) — the model number often appears on the first screen.

Is it safe to download BIOS from sites other than the manufacturer?

Only if the manufacturer's site is genuinely unavailable and the archive site provides a checksum to verify the file. Downloading a corrupted or altered BIOS file can make your computer unbootable. When in doubt, contact the manufacturer's support team and ask them to send the file directly.

Can I use a BIOS file from a different motherboard model?

No. BIOS files are specific to each motherboard model and chipset. Using the wrong file will prevent your computer from starting. Always download the version for your exact model number, which you can find printed on the board or in System Information.

Do I need to update my BIOS if it is working fine?

Not necessarily. Update only if the new version fixes a problem you are experiencing, adds support for a new CPU you plan to install, or addresses a security issue. Unnecessary BIOS updates carry a small risk of failure, so only update when there is a reason to.

What should I do before downloading and installing a BIOS update?

Write down your current BIOS version (found in the BIOS setup screen), back up any important data, and make sure your computer is plugged into power so it does not lose power during the update. Read the readme file that comes with the download before you start, and follow its instructions exactly.