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How To Reflash Bios


How To Reflash Bios

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How To Reflash Bios

How To Reflash Bios

A Comprehensive Guide to BIOS Reflashing for Beginners


The BIOS (Basic Input/Output System) is a crucial firmware that acts as the intermediary between the computer’s hardware and operating system. It initializes and configures the hardware components, enabling the system to boot and operate correctly. In certain scenarios, it may become necessary to reflash the BIOS to update or troubleshoot hardware issues. Reflashing involves overwriting the existing BIOS firmware with a newer or modified version.


Before proceeding with BIOS reflashing, it is essential to ensure the following prerequisites:

  • Computer knowledge: Basic understanding of computer hardware and software.
  • Compatible BIOS: Confirm that the BIOS version you intend to flash is compatible with your motherboard.
  • Backup existing BIOS: Create a backup of the current BIOS firmware before flashing to avoid potential data loss.
  • Stable power supply: Ensure an uninterrupted power supply during the reflashing process.

Methods of BIOS Reflashing

There are two primary methods for BIOS reflashing:

  1. UEFI (Unified Extensible Firmware Interface): Modern motherboards typically support UEFI, which provides a user-friendly graphical interface for BIOS updates.
  2. DOS-based Flashing: For older systems, DOS-based flashing requires creating a bootable USB drive and using specific commands to update the BIOS.

UEFI Flashing Procedure

  1. Download BIOS file: Download the latest BIOS update file from the motherboard manufacturer’s website.
  2. Extract and copy: Extract the BIOS file and copy it to a USB drive formatted in FAT32.
  3. Enter BIOS Setup: Restart the computer and repeatedly press the designated key (usually Del or F2) to enter BIOS Setup.
  4. Identify Update Option: Look for an option labeled "BIOS Update" or "Flash BIOS" in the BIOS Setup menu.
  5. Select USB Drive: Navigate to the USB drive and select the BIOS update file.
  6. Start Flashing: Confirm the update and initiate the flashing process. The computer will restart automatically upon completion.

DOS-based Flashing Procedure

  1. Download BIOS file: Download the BIOS update file and a compatible DOS flashing utility.
  2. Create bootable USB: Use a USB flash drive creation tool to create a bootable USB drive with the DOS flashing utility and BIOS update file.
  3. Restart and boot from USB: Restart the computer and change the boot order in BIOS Setup to boot from the USB drive.
  4. Run flashing utility: At the DOS prompt, run the flashing utility and provide the appropriate command to update the BIOS.
  5. Confirm and restart: Confirm the flash process and restart the computer.

Troubleshooting Common Issues

Flashing process fails:

  • Ensure the power supply is stable and uninterrupted.
  • Verify that the BIOS file is compatible with the motherboard.
  • Try a different USB drive or flashing method.

System instability after flashing:

  • Reset BIOS settings to default values.
  • Update other system drivers, such as chipset and graphics drivers.
  • Check for any hardware conflicts or compatibility issues.

BIOS corruption during flashing:

  • Recover the BIOS using dual BIOS or a backup flash utility.
  • Contact the motherboard manufacturer for assistance.


Q1: Why do I need to reflash the BIOS?

A1: Reflashing the BIOS may be necessary to update hardware compatibility, fix bugs, improve stability, or overclock the system.

Q2: How often should I reflash the BIOS?

A2: Reflashing is generally only required when a specific issue arises or a new BIOS version is released that addresses known problems.

Q3: Is reflashing the BIOS dangerous?

A3: Yes, reflashing the BIOS can potentially damage the motherboard or render the system unbootable if not done correctly.

Q4: What are the risks involved in BIOS reflashing?

A4: Potential risks include BIOS corruption, data loss, hardware damage, and system instability.

Q5: Can I reflash the BIOS without losing data?

A5: Reflashing the BIOS does not affect data stored on hard drives or SSDs. However, it is recommended to back up important data before proceeding.

Q6: How do I know if my BIOS needs updating?

A6: Check the motherboard manufacturer’s website for the latest BIOS version. If your current version is older, an update may be available.


BIOS reflashing can be a crucial step in troubleshooting hardware issues or upgrading system functionality. By following the provided instructions and taking appropriate precautions, you can safely and successfully reflash the BIOS on your computer. However, it is essential to approach the process with caution and contact a qualified technician if you encounter any difficulties.