Free Guide to Checking and Updating Your BIOS

What Is BIOS and Why It Matters

BIOS stands for Basic Input/Output System. Think of it as the software that runs before your operating system starts up. It's the bridge between your computer's hardware (the physical parts like your motherboard, processor, and memory) and the programs you use every day like Windows, macOS, or Linux.

Your BIOS performs several critical tasks when you turn on your computer. It checks that all your hardware components are connected and working properly. It tells your computer which device to start from—usually your hard drive or solid-state drive. It also controls basic settings like the system time, boot order, and hardware monitoring features. Without a functioning BIOS, your computer won't even start.

The BIOS is stored on a special chip on your motherboard called a flash ROM. Unlike your regular hard drive storage, this chip retains information even when the computer is powered off completely. Manufacturers like ASUS, Dell, Lenovo, HP, MSI, and Gigabyte regularly release BIOS updates to fix bugs, improve stability, and add new features.

Many people never think about their BIOS because it works silently in the background. However, updating your BIOS can provide real benefits. Updates may fix security vulnerabilities that hackers could exploit. They can improve compatibility with newer hardware components or operating systems. They sometimes resolve stability issues or crashes that users experience. They occasionally add new features or improve performance.

Practical takeaway: Understanding BIOS basics helps you recognize why manufacturers recommend periodic updates and why checking your BIOS version occasionally is a reasonable maintenance task.

How to Check Your Current BIOS Version

Before you consider updating, you need to know what version of BIOS your computer currently has. The process varies depending on whether you're using Windows, macOS, or Linux, but each method is straightforward.

For Windows users, the easiest approach is through the System Information window. Press the Windows key and R together to open the Run dialog box. Type "msinfo32" and press Enter. A window will open showing detailed system information. Look for the field labeled "BIOS Version/Date." This will show your current BIOS version and when it was last updated. The version number typically looks something like "ASUS F14" or "Dell 2.1.5" depending on your computer manufacturer.

You can also check BIOS version in Windows 10 and Windows 11 through Settings. Open Settings, go to System, then scroll down to "About." Look for "System firmware version" which displays your BIOS information. This method works the same way on newer Windows versions, though the exact menu layout may differ slightly.

For Mac users, click the Apple menu in the top left corner and select "About This Mac." In the window that appears, look for "Boot ROM Version" which shows your Mac's firmware version. Mac firmware works similarly to BIOS on Windows computers and serves the same purpose. You can also see additional hardware details by clicking "System Report" to get more comprehensive information about your machine.

Linux users can open a terminal and type "sudo dmidecode -t bios" to view detailed BIOS information including the version number, manufacturer, and release date. Some Linux distributions also show BIOS version information through their system settings graphical interfaces.

Practical takeaway: Write down your current BIOS version before checking for updates. This information helps you verify that an update was successful and allows you to compare versions if you experience any issues after updating.

Finding the Right BIOS Update for Your Computer

Once you know your current BIOS version, the next step is determining whether an update is available. The key is finding updates from your specific computer manufacturer's official website—not from third-party sites that may distribute outdated or incorrect versions.

If you built your own computer or have a desktop, you need the BIOS update from your motherboard manufacturer. Major motherboard makers include ASUS, MSI, Gigabyte, ASRock, and Intel. Visit the support section of their website, usually found at the bottom of the homepage. Search for your specific motherboard model number. You can find this by checking System Information in Windows or by looking at your original motherboard documentation.

For laptop and pre-built desktop users, go to your computer manufacturer's website. Dell, HP, Lenovo, ASUS, Acer, and other manufacturers maintain support pages where you can enter your model number or serial number. Their site will show all available updates for your specific model. BIOS updates are usually listed separately from driver updates in the support section.

When you find the BIOS update, the manufacturer's website will typically provide a release note explaining what the update fixes or improves. Read this carefully. For example, an update might note "Fixes stability issues when using USB 3.0 devices" or "Improves compatibility with Intel 12th generation processors." These details help you decide if the update addresses issues you're experiencing.

The website will also specify the current version that the update applies to. Don't guess or assume—verify that your current version needs this update. Some updates are incremental (version 1.2 to 1.3), while others are larger jumps (version 1.5 to 2.0). You only need to download the latest version for your motherboard or computer model.

Practical takeaway: Only use official manufacturer websites for BIOS updates. Bookmark your computer or motherboard manufacturer's support page for future reference. Unofficial sources can distribute corrupted or incorrect files that may damage your computer.

Preparing Your Computer Before BIOS Updates

BIOS updates are generally safe when performed correctly, but preparation is essential because the BIOS is fundamental to how your computer operates. A disrupted BIOS update could potentially render your computer unbootable. Taking precautions beforehand significantly reduces this risk.

Start by ensuring your computer has sufficient battery power. For laptop users, charge the battery to 100% before starting the update process. If you're updating a desktop computer, using an uninterruptible power supply (UPS) or surge protector is wise. Never attempt a BIOS update when the battery is low or when power might be interrupted unexpectedly.

Back up your important data. While BIOS updates typically don't affect your files or programs, having a backup on an external hard drive or cloud storage provides peace of mind. This protects you in the unlikely event of any unexpected issues during the update process.

Close all running programs before starting the update. This includes antivirus software, web browsers, messaging applications, and any other background processes. Some manufacturers specifically recommend disabling antivirus temporarily during BIOS updates. Unplug external devices like USB drives, external hard drives, and printers—these can sometimes interfere with the update process.

Document your current BIOS settings if you've made any customizations. Many people use BIOS to adjust settings like boot order, RAM speed, or fan control. Take screenshots or write down these settings in case you want to restore them after the update. While most BIOS updates preserve your custom settings, having documentation provides a reference point.

Choose a time when you won't be rushed or interrupted. BIOS updates typically take 5-15 minutes, but occasionally they may take longer or experience delays. Don't schedule a BIOS update right before you need to use your computer for something important.

Practical takeaway: The three most important preparation steps are ensuring adequate power, closing all programs, and having a data backup. These three actions prevent nearly all potential BIOS update problems.

The BIOS Update Process: Step-by-Step

The specific method for updating BIOS depends on your computer type. Manufacturers typically offer several options, and choosing the right one is important for success.

For Windows users, the most straightforward approach is Windows Update. Many manufacturers now provide BIOS updates through the built-in Windows Update feature in newer computers from Dell, HP, and Lenovo. Go to Settings, select "Update & Security," then click "Check for updates." If a BIOS update is available, it will appear as an important update. Follow the on-screen prompts to install it. Your computer will restart during this process, which is completely normal.

Alternatively, some manufacturers provide dedicated BIOS update utilities. Dell, for example, offers the Dell BIOS Update Utility that you can download