Updating your BIOS the right way unlocks CPU compatibility, fixes stability bugs, and improves memory support without risking your motherboard. By the end of this guide you will have identified your exact board and current BIOS version, prepared a verified update file on a correctly formatted USB drive, flashed through the built-in BIOS utility, and confirmed the new version is running. You need basic comfort navigating Windows and your BIOS, a second device to download files in case you need recovery, and about 30 to 45 minutes of uninterrupted time where you will not lose power.
Before You Start
Take these preparatory checks seriously. A failed flash is almost always caused by the wrong file, an unstable power state, or an interrupted write.
| What you need | Why | Optional? |
|---|---|---|
| Windows PC with internet and your motherboard model name | To download the exact BIOS file for your revision | No |
| USB 2.0 flash drive, 8GB to 32GB, formatted to FAT32 | Most BIOS flash utilities only read FAT32 and fail on NTFS or exFAT | No |
| Stable AC power – desktop plugged into wall outlet, laptop to 100% and charger connected, ideally with a UPS | Power loss during the 2-4 minute write can corrupt the BIOS chip | No |
| Current BIOS version and settings backup | So you can verify the update and restore your settings if needed | No |
| Wired keyboard | Ensures input works inside BIOS without wireless driver issues | Yes |
| Second phone or computer | To look up recovery steps if the screen stays black after reboot | Yes |
To find your board model and BIOS version without opening the case, press Windows + R, type msinfo32, and press Enter. Note System Manufacturer, System Model, and BIOS Version/Date. Alternatively, press Windows + X, select Terminal, and run: wmic baseboard get product,manufacturer,version,serialnumber. Write down the full model including revision, for example ASUS ROG STRIX B650-A GAMING WIFI or MSI MAG B650 TOMAHAWK WIFI, as revisions like Rev 1.0 vs Rev 1.1 use different files.
Step-by-Step
Step 1: Prepare Your System and Document Settings (Time: 5-7 minutes)
Close all apps and disable sleep temporarily. Go to Settings > System > Power > Screen and sleep and set When plugged in, turn off my screen and When plugged in, put my device to sleep to Never. Disconnect non-essential USB devices, leaving only keyboard, mouse, and the target USB drive. Enter your BIOS to record settings: restart and repeatedly press Delete or F2 during POST. For most boards, Delete is standard, F2 is common on ASUS and ASRock, and F12 opens the boot menu on Gigabyte. Once in BIOS, go to the main screen and photograph or write down your memory profile, boot order, and any overclocks. On ASUS: Main shows BIOS Version. On MSI: Press F7 for Advanced Mode, then look at top header. On Gigabyte: Main > BIOS Version. On ASRock: Main > BIOS Version. Press F10 to save if you changed nothing, or Esc to exit without saving, then boot back to Windows.
Step 2: Download the Correct BIOS File (Time: 5-10 minutes)
On your motherboard support page, navigate via Support > Drivers and Utility > BIOS & Firmware or Support > BIOS. Filter by your exact model and revision and choose the latest stable non-beta release unless you need a specific AGESA or Intel ME fix listed in the changelog. Download the ZIP, right-click > Properties > check Unblock if present, then Extract All. Inside you will find a file like B650A1.CAP, MSI.ROM, or BIOS.IMG plus release notes. Read the notes: if it says Requires BIOS 1.20 or higher before updating to 2.10, you must flash the intermediate version first. Never rename files except when your board specifically requires it for USB BIOS Flashback, such as ASUS renaming to CREATIVE.ROM using the included BIOSRenamer.exe, or MSI renaming to MSI.ROM.
Step 3: Format and Load the USB Drive Correctly (Time: 3-5 minutes)
Insert your USB drive. Open File Explorer, right-click the drive > Format. Set File system to FAT32, Allocation unit size to Default, Volume label to BIOS, and uncheck Quick Format for a clean format if this is your first time. Click Start. After formatting, copy only the extracted BIOS file to the root of the drive, not inside a folder. Path should be E:\B650A1.CAP or E:\MSI.ROM, not E:\BIOS_update\B650A1.CAP. Safely eject the drive. If your drive is larger than 32GB and Windows does not offer FAT32, use a smaller drive or format via Disk Management: press Windows + X > Disk Management > right-click partition > Format > FAT32.
Step 4: Flash From Inside the BIOS Using the Built-In Utility (Time: 3-6 minutes active, do not interrupt)
With the USB drive inserted into a rear USB 2.0 port directly on the motherboard I/O, restart and enter BIOS with Delete or F2. Start the utility from its exact location:
ASUS: Go to Tool > ASUS EZ Flash 3 Utility > select Via Storage Device > select your USB drive > select the .CAP file > press Yes to confirm > Yes to start.
MSI: Go to M-FLASH > Yes to reboot into Flash Mode > select file from USB drive > Yes to start. The system will reboot into a dedicated flash screen. Select the file again if prompted.
Gigabyte: Go to Q-Flash > Drive > select file > press Enter > Yes. Or press F8 during POST to launch Q-Flash directly.
ASRock: Go to Tool > Instant Flash > select file > Yes to update.
The progress bar will move from 0% to 100% and the system may appear frozen. Do not press power, reset, or remove the drive. Fans may ramp to 100% and the screen may go black for 30 to 90 seconds at the end. Wait for an automatic reboot. Total write time is typically 120 to 240 seconds. If the board has a BIOS Flashback button for flashing without CPU, only use it if you cannot POST: power off, insert USB into the marked BIOS USB port, press and hold the BIOS Flashback button for 3 seconds until the LED blinks.
Step 5: Load Defaults and Reconfigure Settings (Time: 4-6 minutes)
After the auto-reboot, enter BIOS again with Delete or F2. First load optimized defaults to clear any incompatible NVRAM: ASUS: Press F5 > Yes; MSI: Press F6 > Yes; Gigabyte: Press F7 > Yes; ASRock: Press F9 > Yes. Then re-apply your prior settings. Go to Ai Tweaker / OC / Tweaker > Ai Overclock Tuner or DRAM Profile and re-enable EXPO I or XMP I with your kit’s rated voltage, typically 1.35V for DDR4 or 1.25V to 1.40V for DDR5. Go to Boot > Boot Option #1 and confirm your Windows drive is first. Go to Settings > Security > Secure Boot and ensure it is set to Enabled if it was before, as defaults sometimes disable it. Press F10 > Yes to save and boot to Windows.
Verify It Worked
Boot into Windows and confirm the new version. Press Windows + R, type msinfo32, and check BIOS Version/Date matches the number from the file you downloaded, for example 1820 or 1.30. Open CPU-Z > Mainboard tab and verify BIOS version and date there as well. Check stability: go to Settings > Windows Update and ensure no device errors, then run a brief memory check if you enabled EXPO or XMP. Press Windows + R, type mdsched.exe, and run Windows Memory Diagnostic, or run your normal games and apps for 15 minutes. If Task Manager > Performance > Memory shows your RAM at its advertised speed, for example 6000 MT/s for a DDR5-6000 kit, the profile applied correctly. If the version did not change, you likely selected the wrong file or the drive was NTFS, repeat Step 3 and Step 4.
As of early 2026, many newer boards also support update via Windows-based apps like Armoury Crate or MSI Center, but flashing from inside the BIOS remains the safest method for first timers because it does not depend on Windows drivers.
Mistakes to Avoid
Mistake 1: Flashing the Wrong BIOS File for Your Revision
What causes it: Downloading a file for a similar model name but different revision or chipset, such as B650 vs B650E or Rev 1.0 vs Rev 1.2. How to check: In msinfo32 compare System Model and BaseBoard Product against the file’s support page. The page header must list your exact model and revision. What to do: Delete the wrong file from the USB drive and download the correct revision-specific ZIP. Clear the drive and copy only the correct file to the root. How to undo: If you have not flashed yet, simply replace the file. If you flashed the wrong file and the board will not POST, use USB BIOS Flashback with the correct renamed file or use the dual BIOS switch if your Gigabyte board has one.
Mistake 2: Updating on Battery, Sleep, or Unstable Power
What causes it: Windows sleep timer, laptop on battery, or a power flicker interrupting the 2 to 4 minute write. How to check: Before flashing, verify Settings > System > Power shows sleep set to Never on AC and laptop shows 100% and Charging. Check that your UPS shows no fault light if you use one. What to do: Set sleep to Never, plug the charger in, close background updates via Settings > Windows Update > Pause updates for 1 week, and do not flash during a storm. How to undo: If power was lost mid-flash and the system shows no display and a solid DRAM or CPU LED, perform a CMOS reset: power off, unplug AC, remove CMOS battery for 5 minutes or short JBAT1 / CLRTC pins with a screwdriver for 10 seconds, then retry Flashback.
Mistake 3: Using NTFS or a Subfolder So the BIOS Cannot See the File
What causes it: Formatting the USB drive as NTFS or exFAT or leaving the file inside a ZIP or folder. The flash utility filters for FAT32 root files only. How to check: In File Explorer right-click USB drive > Properties shows File system. Inside the drive you should see only one .CAP, .ROM, or .IMG file at E:\, not E:\folder\file. What to do: Reformat to FAT32 as in Step 3 and copy the extracted file to the root again. Try a rear USB 2.0 port if a front panel hub fails to mount. How to undo: No flash occurred, so just reformat and reload the file correctly and run the utility again. No settings were changed.
Mistake 4: Leaving Overclock or EXPO Enabled During the Flash
What causes it: An unstable memory overclock or undervolt can cause bit errors during the verification phase of the flash. How to check: In BIOS, look under Ai Tweaker > Ai Overclock Tuner or OC > DRAM Frequency. If it shows Manual, XMP, or EXPO instead of Auto before flashing, it was left on. What to do: Before flashing, load optimized defaults with F5, F6, F7, or F9 depending on vendor, then flash. Re-enable the profile only after the update as in Step 5. How to undo: If you already flashed with the profile on and now see boot loops, clear CMOS, boot with defaults, then enable EXPO I or XMP I once and test with F10 save. If instability returns, set DRAM Voltage manually within the kit’s spec range instead of Auto.
FAQ
Do I need to update BIOS if my PC already works fine?
No, if your system is stable, boots reliably, and already supports your CPU and RAM. Update when you need new CPU support, a fix for a specific bug you are experiencing, security patches listed in the changelog, or improved memory compatibility for a new kit. If none of those apply, staying on your current version avoids unnecessary risk.
Will a BIOS update erase Windows or my files?
No. A BIOS update rewrites firmware on the motherboard chip, not the SSD or hard drive. Windows, games, and files remain intact. You will lose custom BIOS settings like fan curves, boot order, and EXPO or XMP, which is why you photograph them in Step 1 and re-apply them after loading defaults. BitLocker may ask for a recovery key after a BIOS change, so have your Microsoft account recovery key handy before you start.
How long does a BIOS update take and when should I force shutdown?
From starting the utility to auto-reboot is usually 3 to 6 minutes. The progress bar should reach 100% and the system should restart on its own. Never force shutdown while the bar is moving or the Flashback LED is blinking. Only consider intervention if the screen has been black with fans at full speed for more than 15 minutes with no LED activity, then hold power for 10 seconds, wait 1 minute, power on, and retry with a different FAT32 USB drive.
Can I downgrade if the new BIOS causes problems?
On most desktop boards yes, by flashing an older version with the same utility, but some updates that include Intel ME or AMD AGESA upgrades block downgrades and will show Security restriction or BIOS version is older error. Check the release notes for phrases like cannot be downgraded or capsule BIOS. If downgrade is blocked, load optimized defaults and re-tune settings or wait for the next stable release that addresses the regression.
