ASUS motherboards with BIOS Flashback let you update the BIOS using only a power supply and a USB drive — no CPU, RAM, or GPU required. This is especially helpful if your system won’t boot with a new processor or if you need to recover from a corrupted BIOS.

Follow the steps below carefully to ensure a smooth update.

VIDEO GUIDE

WRITTEN GUIDE

STEP ONE: DOWNLOAD AND PREPARE THE BIOS FILE

• Go to the ASUS Support Website
• Enter your motherboard model and navigate to the Drivers & Tools tab, then the BIOS & Firmware section
• Download the latest BIOS version for your exact motherboard
• Extract the ZIP file -- inside you will find a .CAP file and a BIOSRenamer.exe tool
• Run the BIOSRenamer.exe tool, and it will automatically rename the BIOS file to the correct format required for your motherboard

STEP TWO: PREPARE THE USB FLASH DRIVE

• Insert a USB flash drive into a working PC
• Format it to FAT32 (right-click on the drive > Format > choose FAT32)
• Copy the renamed BIOS file directly onto the USB drive’s root directory (not inside any folders)

STEP THREE: CONNECT THE USB DRIVE TO THE MOTHERBOARD

• Locate the dedicated BIOS Flashback USB port on the rear I/O of your ASUS motherboard (this port is usually labeled “BIOS” or has a small outline around it)
• Insert the USB flash drive into this specific port

STEP 4: START THE BIOS FLASHBACK PROCESS

• Find the BIOS Flashback button on the rear I/O panel
• Press and hold the button for 3 seconds until the LED begins to blink
• Release the button — the update process has started
• The LED will continue blinking while the BIOS is updating -- this can take several minutes
• DO NOT REMOVE THE USB DRIVE OR POWER OFF THE SYSTEM DURING THE UPDATE

STEP 5: COMPLETE THE UPDATE

• When the LED stops blinking and turns off, the update is complete
• Remove the USB drive
• Power on your system normally
• After updating the BIOS, please allow additional boot time for your RAM timings to be configured. This is a normal, one-time process that only occurs after a BIOS update or BIOS reset.

TROUBLESHOOTING

• LED does not blink: check that the file was renamed correctly and the USB is formatted to FAT32
• LED blinks quickly and then stops: wrong BIOS file or incorrect renaming
• Update seems stuck: some updates take 5–10 minutes; wait until the LED stops blinking