Fix “Selected File Is Not a Proper BIOS”

Updating the BIOS can help resolve hardware compatibility problems, support newer processors or memory, improve system stability, and add important firmware features. However, the process can become confusing when your motherboard displays the message “Selected File Is Not a Proper BIOS” while you are trying to update it.

This message usually appears when the motherboard’s BIOS utility cannot recognize the selected file as a valid BIOS image for that particular motherboard. The problem does not always mean that the BIOS file is damaged. In many cases, you may have downloaded the wrong BIOS version, selected a file for a different motherboard model, used the wrong file format, or placed the file on a USB drive that is not prepared correctly.

Let’s learn the process to fix it!

Fix “Selected File Is Not a Proper BIOS”

To fix the “Selected File Is Not a Proper BIOS” error, first verify your exact motherboard model and BIOS revision, then download the matching BIOS file from the manufacturer’s official website. Extract the downloaded archive if necessary and copy the correct BIOS file to a FAT32-formatted USB drive. Connect the USB drive directly to the appropriate motherboard USB port and start the BIOS update utility again. If the error continues, check whether the motherboard requires a specific BIOS file name, BIOS version sequence, or dedicated BIOS Flashback procedure.

The exact menus and file naming requirements can vary between motherboard manufacturers, so always use the instructions provided for your specific motherboard model.

Step 1: Confirm Your Exact Motherboard Model

The first thing you should check is the exact motherboard model installed in your computer. This is extremely important because manufacturers often release different BIOS files for models that have very similar names.

For example, a motherboard may have a standard version, a Wi-Fi version, a revision-specific version, or a closely related model. A BIOS file designed for one model may not be accepted by another model.

If you can access Windows, press Windows + R to open the Run dialog. Type msinfo32 and press Enter. When the System Information window opens, look for BaseBoard Manufacturer, BaseBoard Product, and BaseBoard Version.

Write down the information shown there. You can also check the motherboard’s model name directly on the motherboard itself, usually printed near the PCIe slots, RAM slots, or another visible area.

If Windows is not starting, check the motherboard’s original packaging, documentation, or the model printed on the board.

Do not download a BIOS file until you are certain about the exact model.

Step 2: Check Your Current BIOS Version

Next, find out which BIOS version is currently installed. This helps you avoid installing an unsuitable firmware file and lets you compare your current version with the available versions from the manufacturer.

In Windows, open System Information again by pressing Windows + R, typing msinfo32, and pressing Enter. Find the entry named BIOS Version/Date.

You can also usually see the BIOS version on the motherboard’s main BIOS screen.

Make a note of the version number. For example, it might look something like Fxx, A.xx, 1.xx, or another manufacturer-specific format.

Knowing the current version is particularly useful if the manufacturer recommends installing an intermediate BIOS version before installing a newer one.

Step 3: Download the BIOS File for the Correct Motherboard

Now visit the official support website of your motherboard manufacturer and search for your exact motherboard model.

Look for the BIOS, Firmware, or Support section. Carefully compare the model shown on the website with the model you identified in the previous steps.

Download the BIOS version you actually need.

Avoid downloading BIOS files from random third-party websites. A BIOS file is firmware that directly controls important motherboard functions, so using an incorrect or modified file can create additional problems.

Pay attention to the manufacturer’s notes for the BIOS release. Some updates may require a particular previous version, while others may include processor, memory, security, or compatibility changes that affect the update process.

Step 4: Extract the Downloaded BIOS File

Many motherboard manufacturers provide BIOS downloads as a ZIP archive rather than as a BIOS file directly.

If the downloaded file ends in .zip, right-click it and select Extract All. Open the extracted folder and look for the actual BIOS file.

Do not copy the ZIP file itself to the USB drive if the motherboard’s update utility expects the extracted BIOS image.

The BIOS file may have a manufacturer-specific extension or filename. Depending on the motherboard, you may also find a text document containing update instructions.

Read the instructions included with the BIOS download because they may specify a required filename, USB port, or update procedure.

Step 5: Check Whether the BIOS File Needs to Be Renamed

Some motherboards require the BIOS file to have a specific filename when using a feature such as BIOS Flashback.

This is different from simply browsing for a BIOS file through a normal BIOS update utility.

If the manufacturer’s instructions provide a BIOS renaming utility or specify a particular filename, follow those instructions exactly.

Do not randomly rename the file. Changing the filename to something that looks correct does not make an incompatible BIOS file valid.

If the manufacturer’s instructions do not require renaming, leave the BIOS filename unchanged.

Step 6: Prepare the USB Drive as FAT32

The USB drive used for a BIOS update should normally be formatted as FAT32, unless your motherboard manufacturer specifically instructs you to use another format.

Connect the USB drive to a working Windows computer. Open File Explorer, right-click the USB drive, and select Format.

Under File system, select FAT32 if it is available. You can leave the allocation unit size at its default setting. Give the drive a simple name if desired, then start the formatting process.

Remember that formatting removes the existing files from the USB drive. Copy any important files from the USB drive to another location before formatting it.

After formatting, copy the extracted BIOS file to the root directory of the USB drive. The root directory means the main screen of the USB drive, rather than placing the file inside several folders.

Step 7: Use the Correct USB Port

If the motherboard has several USB ports, the BIOS update utility may work more reliably with a specific port.

Some motherboards have a USB port labeled BIOS, Flashback, or something similar. This port is especially important when using a dedicated BIOS Flashback feature.

If your motherboard documentation identifies a particular USB port for BIOS updates, use that port.

If there is no dedicated port, connect the USB drive directly to a rear motherboard USB port instead of using a front-panel extension, USB hub, docking station, or adapter.

This can eliminate communication problems between the motherboard firmware and the USB drive.

Step 8: Open the Correct BIOS Update Utility

Restart the computer and enter the BIOS or UEFI setup. The key used to enter the firmware interface varies by motherboard and may be Delete, F2, or another key.

Inside the BIOS, look for the manufacturer’s firmware update utility. Different manufacturers use different names for these utilities.

For example, you may see an option specifically intended for updating BIOS firmware from a USB drive.

Select the update utility and browse to the USB drive. Select the extracted BIOS file.

If the correct BIOS file is now recognized, the previous “Selected File Is Not a Proper BIOS” message should no longer appear.

Step 9: Check the BIOS Revision or Motherboard Revision

If the error continues, check whether your motherboard has a hardware revision.

Some motherboard models are sold in multiple revisions, and their BIOS files may not be interchangeable. A revision number may be printed directly on the motherboard, often near the model name.

Compare the revision on the motherboard with the information shown on the manufacturer’s download page.

For example, a BIOS intended for one hardware revision may not be accepted by another revision even when the motherboard model name appears almost identical.

This is one of the reasons downloading the BIOS file solely by searching for a similar-looking model name can cause this error.

Step 10: Check for BIOS Update Requirements

Some manufacturers have special requirements for particular BIOS updates.

A newer BIOS may require you to install an earlier version first. The manufacturer’s support page may mention this under BIOS Notes, Important, Description, or Update Instructions.

Read these notes carefully before trying the update again.

Also check whether the update is intended for your exact processor or motherboard configuration. If the manufacturer specifically recommends a particular update method, follow that method instead of attempting to force the file through another BIOS utility.

Step 11: Try a Different USB Drive

If the BIOS file is definitely correct but the motherboard still refuses to recognize it, the USB drive itself may be causing the problem.

Try another USB drive, preferably a simple, smaller-capacity drive if one is available. Format it as FAT32, copy only the required BIOS file to it, and try the update again.

Avoid putting several BIOS files on the same USB drive while troubleshooting. Keeping only the required file makes it easier to identify the correct firmware image.

You should also avoid USB hubs and connect the drive directly to the motherboard.

Step 12: Use BIOS Flashback If Your Motherboard Supports It

Some modern motherboards provide a dedicated BIOS Flashback feature. This feature can update the BIOS using a specially designated USB port and button, sometimes without entering the normal BIOS update utility.

However, Flashback has its own requirements. The USB drive may need to be FAT32, the BIOS file may need a specific name, and the file may need to be placed in the root directory.

Follow the exact Flashback instructions for your motherboard.

Do not interrupt the process once the BIOS update has started. Turning off the computer or disconnecting power during a firmware update can cause serious problems.

Step 13: Do Not Force an Incompatible BIOS File

If the motherboard continues to report that the selected file is not a proper BIOS, do not try to force the update simply because the BIOS version appears newer.

The error can be a useful warning that the firmware image does not match what the motherboard expects.

Recheck the motherboard model, hardware revision, BIOS file, file extension, filename requirements, and update method.

If all of these are correct and the error remains, consult the motherboard manufacturer’s support documentation before proceeding.

FAQs

Why does my motherboard say “Selected File Is Not a Proper BIOS”?

This usually means that the BIOS update utility cannot identify the selected file as a valid firmware image for the motherboard. Common causes include an incorrect BIOS file, wrong motherboard revision, incomplete extraction, incorrect filename, or an unsupported update method.

Does the BIOS file need to be extracted?

In many cases, yes. BIOS downloads are frequently provided inside a ZIP file. You generally need to extract the archive and use the actual BIOS image specified by the manufacturer’s instructions.

Should the USB drive be FAT32?

For many motherboard BIOS update procedures, FAT32 is the recommended file system. However, always follow the requirements for your particular motherboard because update methods can differ.

Can I use any BIOS version?

No. You should use a BIOS file specifically intended for your exact motherboard model and revision. Installing an incompatible BIOS can cause serious firmware problems.

Why is my BIOS file not showing on the USB drive?

Check whether the USB drive is formatted correctly, whether the BIOS file has been extracted, and whether the file is located in the USB drive’s root directory. Also check whether your motherboard requires a specific filename.

Can I rename the BIOS file myself?

Only if the motherboard manufacturer’s instructions tell you to do so. Some Flashback systems require a specific filename, while other BIOS update utilities expect the original filename.

What should I do if the correct BIOS file still does not work?

Try another FAT32-formatted USB drive and a different USB port. Then verify the motherboard’s exact model and hardware revision again. If the error continues, check the manufacturer’s BIOS update instructions for special requirements or contact the manufacturer’s support service.

Summary

The “Selected File Is Not a Proper BIOS” message generally means that the motherboard cannot validate the BIOS file you selected. The most important troubleshooting step is to make sure the BIOS file matches the exact motherboard model and hardware revision.

Start by checking the current BIOS version and motherboard information. Download the appropriate BIOS file from the manufacturer’s official support page, extract it correctly, and follow any instructions about renaming the file. Prepare a FAT32 USB drive, place the required BIOS file in its root directory, and connect it directly to the appropriate motherboard USB port.

If the normal BIOS update utility continues to reject the file, check for manufacturer-specific requirements or use BIOS Flashback if your motherboard supports it. 

Most importantly, never force an incompatible BIOS file or interrupt the firmware update once it has started.