What Updating Your BIOS Actually Does
Your BIOS (or UEFI, on modern boards) is the low-level firmware that initializes your hardware before your operating system loads. Updates fix CPU compatibility, memory stability, security vulnerabilities, and sometimes add features like Resizable BAR or newer CPU microcode.
The process itself is simple in theory. In practice, the difference between a smooth update and a bricked board comes down to preparation and choosing the right method for your specific motherboard.
Before You Start: What You Need
Updating your BIOS carries a small but real risk. If the process is interrupted (power loss, USB drive removed mid-flash), the board can become unusable until the chip is reflashed with a hardware programmer. Here is what you need to avoid that scenario.
An uninterruptible power supply (UPS) or a fully charged laptop. If you are on a desktop, plugging into a UPS is the single most effective way to prevent a brick. No UPS? Do the update during stable weather when the chance of a power flicker is lowest.
A USB flash drive formatted to FAT32. Most boards only read FAT32 from the BIOS flash utility. ExFAT and NTFS will not work. Format the drive on another computer, set the allocation size to default, and make sure nothing else is on the drive.
Your exact motherboard model and current BIOS version. Downloading the wrong BIOS file is the second most common mistake. We cover how to check both below.
How to Find Your Motherboard Model and BIOS Version
On Windows, open the Start menu, type “System Information,” and look for two entries: BaseBoard Product (your motherboard model) and BIOS Version/Date (your current firmware version and release date). Write both down before browsing the manufacturer’s support page.
On Linux, run sudo dmidecode -t baseboard for the model and sudo dmidecode -t bios for the version. On macOS, this is not applicable since Apple handles firmware updates through System Settings.
Cross-check the motherboard model against the physical board itself. Some manufacturers (especially ASUS and Gigabyte) release multiple revisions of the same board under the same product name. The revision number is printed directly on the PCB, usually near the model name or between the PCIe slots.
Three Ways to Update Your BIOS
The method available to you depends on your motherboard’s age and feature set. Older boards (pre-2015) almost always require the USB flash method. Modern boards offer options that are much harder to mess up.
Method 1: USB Flash (Works on All Boards)
This is the universal fallback. Download the latest BIOS file from the manufacturer’s support page for your exact model and revision. Extract the ZIP file. The extracted folder usually contains a readme, a BIOS file with a short extension like .CAP or .ROM, and sometimes a rename tool.
Copy the BIOS file (not the folder, just the single file) to the root of your FAT32 USB drive. Some manufacturers require the file to be renamed to a specific name before the BIOS utility recognizes it. Gigabyte boards, for example, need the file renamed to GIGABYTE.bin. Check the readme file.
Restart your computer and enter the BIOS setup. The key is usually Del, F2, or F10 (check your boot screen). Inside the BIOS, look for a section called EZ Flash, M-Flash, Q-Flash, or BIOS Update depending on the brand. Select the USB drive, choose the BIOS file, and confirm.
The flash takes two to five minutes. Do not touch the power button or remove the USB drive during this time. The board will restart automatically when done.
Method 2: BIOS Flashback or USB Flash Port (Modern Boards Only)
Many modern boards (especially mid-range and above from ASUS, MSI, Gigabyte, and ASRock) include a dedicated BIOS Flashback port and button. This is the safest method because it does not require a CPU, RAM, or GPU to be installed at all.
Check your motherboard’s rear I/O panel for a USB port labeled BIOS Flashback, USB BIOS Flashback, or similar, usually with a nearby button. Plug the FAT32 USB drive with the renamed BIOS file into that specific port (not any other USB port). Press and hold the Flashback button for about three seconds. A blinking LED indicates the flash is in progress.
When the LED stops blinking (usually after three to five minutes), the update is complete. This method is particularly useful if you are building a new system with a CPU that requires a BIOS update before it will boot at all, such as pairing a Ryzen 5000 series with a B450 board that shipped with an older BIOS.
Method 3: Within Windows via Manufacturer Utility
Several manufacturers provide Windows-based update tools: ASUS Armoury Crate, MSI Dragon Center / MSI Center, Gigabyte App Center. These tools detect your board, check for available updates, and apply them from within Windows.
This is the most convenient method but also the riskiest. If Windows crashes, hangs, or applies a driver update mid-flash, the BIOS update fails and your board may not boot. Only use this method if you do not have a USB drive available and you are willing to accept the added risk. For any board with a Flashback port, use Method 2 instead.
Quick Fix Checklist: When the BIOS Update Fails
The board powers on but shows a black screen. Clear the CMOS by removing the coin-cell battery on the motherboard for 30 seconds, or short the CLR_CMOS jumper with a screwdriver. This resets the BIOS to factory defaults and often recovers a failed partial update.
The USB flash utility says “file not found” or “invalid file.” The BIOS file likely needs to be renamed to a specific format, or you downloaded the wrong revision. Check the readme file that came with the BIOS download. Also confirm the USB drive is FAT32 and the file is on the root directory, not inside a subfolder.
The board beeps repeatedly or flashes an error LED. Consult the motherboard manual and locate the error code or beep pattern. A single long beep followed by two short beeps on most boards indicates a memory or graphics initialization failure, which can happen after a BIOS update if the new firmware changed the default RAM timing profile. Clear CMOS first, then try booting with a single stick of RAM in the slot labeled DIMM_A2.
The board does not power on at all after a flash. If you have a BIOS Flashback port, try reflashing the same file using Method 2. If the board does not have Flashback and clearing CMOS did not help, the BIOS chip needs to be reflashed externally with a hardware programmer like a CH341A. This is a salvageable situation but requires removing the BIOS chip from the board or using a clip-on programmer probe.
When You Should Not Update
Most BIOS updates are optional. If your system is stable, all your hardware is recognized, and you are not installing a new CPU or running into a specific bug listed in the changelog, there is no compelling reason to update. The old rule “if it is not broken, do not fix it” applies more to BIOS updates than almost any other software update, because the process carries a hardware-level risk that regular OS updates do not.
The exceptions: security patches for vulnerabilities like LogoFAIL or access control flaws, support for newer CPU generations, and fixes for memory instability issues at rated XMP/EXPO speeds are worth taking the small risk.