Do I Need a USB to Update BIOS? exFAT, Extracting Files & More

AvatarByEric Dawson Computers & Software

No, you do not always need a USB drive to update BIOS, but you need one for the two methods most motherboard makers document first. Firmware-side tools such as ASUS EZ Flash 3, MSI M-Flash, and Gigabyte Q-Flash read the update from a FAT32 USB stick, and the no-CPU recovery buttons (USB BIOS FlashBack, Flash BIOS Button, Q-Flash Plus) only work from USB. The USB-free routes are a Windows updater from your PC or board maker, such as Dell’s downloadable BIOS executable, MSI Center, or Gigabyte Control Center, and on some boards an internet update run from inside the firmware. As of September 2026, every official guide checked for this article still asks for FAT32, not exFAT, when a drive is involved.

When You Need a USB to Update BIOS and When You Don’t

You need a USB drive for two of the four update paths, the firmware flash utility and the hardware recovery button. The other two paths, a Windows-based updater and a firmware internet update, need no drive at all. Intel’s guide to BIOS updates describes the classic route as download the file, extract it, copy it to a properly formatted USB drive, and run the flash utility from the firmware menu during POST. The same Intel page notes that some boards ship with a utility that updates from within Windows, and that some have a dedicated port and LED for updating without booting at all.

Here is how the four paths compare, based on the ASUS, MSI, Gigabyte, Dell, and Intel documentation read for this article.

Method USB drive needed Working CPU and RAM needed Examples
Windows updater (executable or vendor app) No Yes, Windows must boot Dell BIOS .exe, HP updater, MSI Center, Gigabyte Control Center, ASUS Windows tool
Firmware flash utility Usually yes (FAT32); some boards read an internal drive Yes ASUS EZ Flash 3, MSI M-Flash, Gigabyte Q-Flash, Dell F12 BIOS Flash Update
Firmware internet update No, needs wired network in most cases Yes Online option inside EZ Flash or M-Flash on supported boards
Hardware recovery button Yes (FAT32, renamed file) No ASUS USB BIOS FlashBack, MSI Flash BIOS Button, Gigabyte Q-Flash Plus

A prebuilt desktop or laptop from Dell, HP, or Lenovo is the easiest case. Dell’s BIOS support article lists three steps for its Windows method: download the update from Drivers and Downloads using your Service Tag, open the file and follow the prompts, and let the system restart itself. No drive is involved. A self-built desktop is different, because the motherboard maker’s primary instructions assume a USB stick, and the fallback recovery method demands one.

Can You Update BIOS Without USB

Yes, on most systems made in the last several years, through one of three routes. Which route applies to you comes down to whether the machine is a branded prebuilt, a self-built desktop, and whether it currently boots.

Windows Executables from Prebuilt Makers

Dell, HP, and Lenovo all publish BIOS updates as Windows programs. Dell’s guide asks you to plug in the AC adapter on a laptop, keep at least 50 percent battery, close background programs, and unplug docks and external drives before running the file. If BitLocker is on, Dell says to have your recovery key handy, because the firmware change can trigger a recovery prompt on the next boot. A June 2026 answer on Microsoft Q&A gives the same picture for HP, noting that HP’s downloadable BIOS package runs directly from Windows and reboots to flash on its own.

Motherboard Maker APPS

MSI Center, Gigabyte Control Center, and ASUS’s Windows update tool can download and flash a BIOS from the desktop. The Microsoft Q&A thread lists Gigabyte Control Center as a direct alternative to Q-Flash, and in a June 2025 Tom’s Hardware forum thread the first reply to someone stuck with an exFAT stick on an MSI B650 Tomahawk WiFi was simply to use MSI Center instead. ASUS itself is lukewarm on this route. Its EZ Flash 3 support page says the Windows tool is the usual way for general users, then warns that a malware infection or a large number of resident programs can cause the update to fail, which is why the firmware-side tool exists.

Internet Update and Internal Drive Inside the Firmware

Some boards let the firmware fetch the update itself. The Microsoft Q&A answer describes an online option within tools like EZ Flash or M-Flash that needs a working network connection in firmware, usually wired Ethernet, since Wi-Fi drivers rarely load before the operating system. That answer also notes that certain vendors let you browse to a BIOS file stored on an internal SSD or hard drive, so you can download the file in Windows, leave it in a folder on C:, reboot into the flash utility, and pick it from there. Not every board exposes either option, and as of September 2026 the ASUS and MSI support pages read for this article only document the USB path, so check your own board’s manual before relying on it.

Can I Use exFAT for a BIOS Update

No. Every manufacturer page consulted asks for FAT32, and one of them says outright that other formats will fail. MSI’s desktop BIOS update guide states that formatting must convert the drive to FAT32 and that a drive in NTFS or exFAT will not allow you to update the BIOS. ASUS’s EZ Flash 3 page says the utility only supports single-sector USB flash drives in FAT16 or FAT32, and its USB BIOS FlashBack guide adds that the drive must use the MBR partition scheme and hold at least 1 GB. Dell’s F12 BIOS Flash Update tool also wants FAT32, and a February 2025 post on the Dell community forum from a Latitude 5400 owner confirms the tool ignored an exFAT stick until it was reformatted.

Forum advice is less uniform than the official pages. In the Tom’s Hardware thread, one reply said MSI’s flash tool is notoriously picky and that sticks under 32 GB work best, another recommended an old 8 GB drive, and a third suggested shrinking a big drive to a 32 GB partition so Windows will offer FAT32. On the MSI forum, a user told a B450M owner to avoid USB 2.0 sticks, which contradicts the widespread belief that USB 2.0 is safer. The manufacturer pages are the better authority here, and they specify file system, partition scheme, and minimum capacity, not USB generation. Get those three right and either generation of stick should work.

Why 64 GB and Larger Sticks Arrive as exFAT

The Windows Format dialog has refused to create FAT32 volumes above 32 GB for decades, so any larger drive defaults to exFAT. Hackaday reported on April 17, 2026 that Microsoft raised the limit to 2 TB in Windows 11 Insider Preview Build 26300 for both the graphical dialog and the command-line format tool, after first announcing the command-line change in 2024. Until that build reaches your PC, a 64 GB or 128 GB stick will still show only exFAT and NTFS in the dialog.

How to Format a USB Drive as FAT32 in Windows

  1. Back up the drive. Formatting erases everything on it.
  2. Open File Explorer, right-click the USB drive under This PC, and choose Format.
  3. Set File system to FAT32. Leave Allocation unit size at Default and Quick Format ticked.
  4. Click Start, confirm the warning, and wait for the Format Complete message.

If FAT32 Is Missing from the List

Shrink the drive to a partition of 32 GB or less first. Open Disk Management (right-click Start, then Disk Management), right-click the USB volume, choose Delete Volume, then right-click the unallocated space, choose New Simple Volume, set the size to 30,000 MB or so, and select FAT32 during the wizard. Both the Tom’s Hardware reply and ASUS’s single-partition requirement point the same way: one small FAT32 partition, MBR, nothing else on the stick.

How to Extract BIOS File Downloads for Each Brand

Extract the download with Windows’ built-in Extract All command, since no third-party software is needed. Every BIOS download arrives as a .zip archive that the flash utility cannot read directly, so unzipping comes first. What differs is what you do with the file afterwards, and each brand has its own naming rule.

Extracting the Archive in Windows

  1. Download the BIOS for your exact board model from the maker’s support page. Check the revision (for instance B450 TOMAHAWK MAX, not B450 TOMAHAWK).
  2. Right-click the .zip and choose Extract All, then Extract. MSI’s motherboard guide uses exactly these two clicks.
  3. Copy the result to the root of the FAT32 stick. MSI says to copy the whole extracted folder to the root and never bury the file in subfolders, because M-Flash may not find it.
  4. Eject the drive with Safely Remove Hardware so the copy is complete.

ASUS: Run BIOSRenamer for FlashBack

An ASUS archive contains a .CAP file and a small program called BIOSRenamer. For EZ Flash 3, the .CAP file works as extracted. With USB BIOS FlashBack, the ROG support page says to double-click BIOSRenamer, which renames the .CAP to the short name the board expects, press any key to close the window, then copy the renamed file to the root of the stick. Skipping this step is the most common reason FlashBack fails.

MSI: Rename to MSI.ROM Only for the Flash BIOS Button

MSI uses two different rules, and mixing them up causes confusion. For M-Flash from inside the firmware, MSI’s October 2024 guide says to copy the extracted folder as-is, and a Tom’s Hardware reply correctly points out that no renaming is needed. With the Flash BIOS Button, MSI’s May 2024 guide says to rename the extracted file to MSI.ROM, confirm the extension change, and put it on the stick, then insert the stick into the rear port labeled BIOS.

Gigabyte: Rename to GIGABYTE.bin for Q-Flash Plus

Gigabyte’s AORUS blog says Q-Flash, run from inside the firmware with F8, takes the extracted file under its original name. Q-Flash Plus, the no-CPU method, needs the file renamed to GIGABYTE.bin and placed in the root of the drive plugged into the specific port shown in the manual.

Which BIOS Version Do I Need for Ryzen 7 5800X

The Ryzen 7 5800X needs a BIOS built on AMD’s AGESA ComboAm4v2PI 1.1.0.0 or later on 400 and 500 series boards, and AGESA 1.2.0.7 or later on 300 series boards. Those are AMD’s code versions, so the practical way to know is to read your board’s CPU support list, which names the exact vendor BIOS that added the chip.

A Worked Example: MSI B450 TOMAHAWK MAX

MSI’s support page for the B450 TOMAHAWK MAX lists the Ryzen 7 5800X (B0 stepping) as supported since BIOS 7C02v3A, released February 8, 2021, with a changelog reading updated AMD AGESA ComboAm4v2PI 1.2.0.0 and optimized and support AMD Ryzen 5000 series processors. The newer B2 stepping of the 5800X, the version most likely to arrive in a retail box today, is listed against the latest beta BIOS. A 5800X3D needs 7C02v3D from April 2022, and the current release as of September 2026 is 7C02v3K from April 30, 2025, which carries AGESA 1.2.0.E. On this board, anything at 7C02v3A or newer boots a 5800X, and the newest stable release is the sensible target.

How to Read Any CPU Support List

  1. Find your board’s support page and open the CPU or Compatibility tab.
  2. Search the list for 5800X and note the BIOS version in the result column. There may be two rows for different steppings.
  3. Open the BIOS tab and compare that version with the one you have. Press the Windows key, type msinfo32, and read BIOS Version/Date in System Information.
  4. Flash the listed version or newer while the old CPU is still installed.

Older Boards: X370, B350, and A320

HWCooling reported on March 18, 2022 that AMD had lifted the block on Ryzen 5000 for 300 series chipsets with AGESA 1.2.0.7, and that earlier AGESA versions deliberately prevented Zen 3 chips from booting on those boards. Beta BIOS files followed in April and May 2022 from most vendors. If you own one of these boards, the CPU support list will show a 2022 or later BIOS, and some vendors never moved the update out of beta.

Update Before You Swap the CPU

The microcode for the new chip has to be in the firmware before the chip goes in. An October 2022 thread on the MSI forum shows what happens otherwise: a B450M Gaming Plus owner installed a 5800X over a Ryzen 5 2600, got a black screen, put the 2600 back and still got a black screen, and was told by several replies to flash with the old CPU in place or use the Flash BIOS Button with a different FAT32 stick. If your old CPU is already gone, the recovery buttons in the next section are the only way forward without borrowing a supported chip.

How to Update BIOS with a USB Drive on ASUS, MSI, and Gigabyte

Restart the PC, enter the firmware setup menu, and run the board maker’s flash utility, ASUS EZ Flash 3, MSI M-Flash, or Gigabyte Q-Flash, then choose the BIOS file from the FAT32 USB drive. Back up your data first, plug the PC into a reliable outlet, and keep the instructions open on your phone, since the screen will be busy.

ASUS EZ Flash 3

  1. Restart and press Del when the ASUS logo appears.
  2. Press F7 or click Advanced Mode.
  3. Open the Tool tab and click ASUS EZ Flash 3 Utility.
  4. Select the USB drive, click the .CAP file, and click Yes.
  5. Confirm the BIOS information and click Yes again. When the progress bar finishes, click OK and the board reboots.

MSI M-Flash

  1. Press Delete repeatedly at the boot screen to enter Setup.
  2. Click M-FLASH and click Yes. The computer reboots into the flashing interface.
  3. Select the USB drive, open the extracted folder, choose the BIOS file, and press Enter.
  4. Select Yes to start. The PC restarts on its own when done.
  5. Press Delete again after the restart and confirm the new version on the main page.

Gigabyte Q-Flash

  1. Press Delete during boot to enter the firmware.
  2. Press F8 to open Q-Flash and choose Update BIOS.
  3. Pick the file on the USB drive, click Yes, wait for verification, then click Start.
  4. Wait several minutes for the flash and the automatic reboot.

After any of these, ASUS recommends loading defaults once (press Del at the logo, then F5, then OK) to clear settings left over from the old firmware. Re-enter your memory profile and boot order afterwards.

What to Do if the Update Fails or the PC Won’t Boot

Most update failures trace back to the USB drive rather than the motherboard. Reformatting the stick, checking the port, and matching the file name to the tool being used resolves most cases before the firmware chip itself needs suspecting.

The Flash Utility Can’t See the File

Reformat the drive as FAT32 on a single MBR partition, put the extracted file in the root, and try a different USB port, ideally a rear port wired directly to the board. If the Format dialog only offered exFAT, follow the partition shrink in the section above. On MSI boards, M-Flash wants the extracted folder, while the Flash BIOS Button wants a file named MSI.ROM, so check which tool you are using.

The Recovery LED Behaves Oddly

ASUS says that a FlashBack LED which blinks for about five seconds and then stays solid means the process did not start, and the two things to check are the drive format and whether BIOSRenamer was run on the correct file for that board model. A normal run blinks for up to eight minutes and then the light goes out. Gigabyte’s Q-Flash Plus starts automatically about 20 seconds after a failed boot attempt when a GIGABYTE.bin file is present, and the BIOS LED blinks for a few minutes before stopping. MSI’s Flash BIOS Button LED flashes rapidly and then turns off when the write is complete.

The Progress Bar Looks Stuck

MSI’s guidance is to wait another three to five minutes before doing anything, and to contact MSI service if nothing changes after that. Never press the reset button, pull the stick, or cut the power during a write. ASUS makes the same point for FlashBack: removing the drive or pressing CLR_CMOS mid-flash will leave the board unable to boot.

Intel Boards: ME Firmware After FlashBack

On ASUS Intel 800 series boards, the ROG page notes that FlashBack writes only the .CAP file, so the Management Engine firmware must be updated separately afterwards. Older 400 series ASUS boards needed ME firmware 14.1.51.1528 or newer before an 11th generation Intel CPU would work following a FlashBack update.

A Gigabyte Board with DualBIOS

The AORUS blog explains that boards with DualBIOS carry a backup chip that loads automatically if the main firmware is corrupted, letting you boot and reflash the main BIOS with Q-Flash. If both copies fail, Q-Flash Plus with a renamed file is the last resort before a service center.

Frequently Asked Questions

Do I Need a USB 2.0 Drive to Update BIOS?

No manufacturer page read for this article specifies a USB generation. ASUS asks for a single-partition FAT16 or FAT32 stick of 1 GB or more in MBR format, and MSI asks for FAT32. A USB 3.x stick formatted that way is fine, although a small, older drive tends to have fewer surprises because it was never exFAT to begin with.

Will Updating the BIOS Delete My Files?

A BIOS update writes to a chip on the motherboard, not to your SSD or hard drive, so personal files are untouched. What does reset is the firmware configuration, including boot order, memory profiles, and fan curves. Intel still recommends backing up important files first because a failed flash can leave the PC unbootable until it is repaired.

How Long Does a BIOS Update Take?

Intel suggests allowing about five minutes for a typical flash. ASUS says FlashBack can take up to eight minutes depending on file size, and Gigabyte describes Q-Flash and Q-Flash Plus as taking several minutes each. If a progress bar appears frozen, MSI advises waiting another three to five minutes before contacting support.

Should I Update BIOS Every Time a New Version Comes Out?

Not necessarily. Intel’s guide says BIOS updates are not routine and usually should not be performed on a PC that is working normally, because an interrupted flash can corrupt the firmware. Update when you need a new CPU or memory supported, when the changelog fixes a problem you have, or when it closes a security hole such as the Sinkclose fix MSI shipped in a September 2024 beta BIOS for the B450 TOMAHAWK MAX.

Can I Use the BIOS File Straight from the Zip?

No. The flash utilities read a single .CAP, .ROM, or .bin file from the drive, and none of them can open a .zip archive. Extract it in Windows with Extract All, apply any renaming your brand requires, and copy the result to the root of the stick.

If your PC boots and it is a Dell, HP, or Lenovo, run the Windows updater and skip the USB stick entirely. On a self-built desktop, spend two minutes formatting a small drive as FAT32 on one MBR partition, extract the archive with Extract All, rename the file only if your brand’s recovery tool asks for it, and flash from the firmware menu with the old CPU still installed. Keep that stick in a drawer afterwards, because the same drive with the same file is what rescues the board if a future update goes wrong.

References

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Eric Dawson
Eric Dawson
Eric Dawson is the writer and curious mind behind The Money Watch. Based in Columbus, Ohio, he has a habit of digging into everyday questions until he understands what is actually going on, whether the subject is technology, travel, shopping, food, business, consumer products, or one of life's oddly specific problems.

Rather than pretending to be an expert in everything he covers, Eric approaches each topic as a careful researcher and practical problem-solver. He favors original sources, clear explanations, and honest answers about uncertainty. His goal is simple: do the digging readers shouldn't have to do themselves and turn what he finds into useful information without wasting their time.