How to Fix “Selected File Is Not a Proper BIOS”?
Updating your BIOS is relatively complex. You can get plenty of error messages if you try to flash the wrong file or have downloaded an incompatible software. It can also occur when trying to flash your BIOS from an external device.
This error message appears mainly on your BIOS screen during the PC’s boot cycle.
Suppose you tried manually updating your BIOS but encountered the error message “Selected file is not a proper BIOS”. In that case, this article will show you the most common causes and ways to troubleshoot them and prevent them from happening again.
Possible Causes for the Error
There are two main categories of causes for this error message, one being that either the file or boot drive is improperly set up, or that the way you are trying to update your BIOS is done incorrectly.
Here is a list of the most common causes for receiving the error message:
- You have downloaded the wrong BIOS file
- The BIOS file is corrupt
- The external drive is malfunctioning
- Your drivers are outdated
- Your external hard drive is not correctly formatted
- The BIOS update is not compatible with your current BIOS version
Now that you know the typical causes for this error and what specifically to look out for, the next step is troubleshooting:
How to Fix “Selected File Is Not a Proper BIOS”?
There are several fixes to solve this issue. I have compiled the list of some of the solutions below.
Update BIOS Using Proper File
The most common reason for this error is simply using the wrong file type. Suppose you went online and downloaded some new BIOS software. If the file was for example made for x64 architecture, and your PC is using x86 chances are that you will get a compatibility error.
Another issue within the same category is that the file you downloaded was correct but did not feature the latest available version.
To fix this problem, take a note of the following points:
- Double-check the exact name and model number of your motherboard. Ensure that the version you are downloading online is for the exact same motherboard. A single different letter in the model number could denote an entirely different BIOS file.
- If you spot any mismatches, redownload the proper version and try updating your BIOS again.
You can also check our article on how to check BIOS version for further reference. After you are done with this step and if the issue persists follow along with the next one.
Check If the Downloaded File Is Corrupted
After you check that the BIOS file is for your exact motherboard model, you might still run into some issues if the file becomes corrupt during download.
To fix this issue, redownload the BIOS file again and ensure that your anti-malware software is not deleting or altering the downloaded file. The way to do it is to temporarily disable your antimalware when you download the file.
Update Drivers

The most common reason for receiving “Selected file is not a proper BIOS” is because your other drivers are not up to date, especially the chipset drivers. Before you go further into troubleshooting, start up your PC and update any drivers that are outdated and have pending updates.
You can also check out our comprehensive guide on updating the device drivers.
Check Your External Hard Drive for Malfunctions

You could also get this error if you are using a faulty USB stick. A USB’s read/write function becomes corrupted if it experiences some physical or static shock. Another common cause of external hard drive damage is not ejecting it from the toolbar before unplugging it.
The fix here is simple, get a different flash USB or external hard drive, upload the file, and try updating your BIOS again.
Format Your External Drive Properly
Formatting is how data is stored and read. Suppose you are trying to install your operating system on a clean hard drive. In that case, both the hard drive and the external drive carrying the OS files must be formatted beforehand. Likewise, while installing or putting custom BIOS on any external drive, it must be formatted appropriately first.
Different BIOS are compatible only with certain types of formatted drives. If the BIOS is UEFI, it is best to format the disk with the FAT32 type file system. UEFI is the most up-to-date method of booting your PC.
NTFS on the other hand is better suited for use with internal drives, so you should stick to FAT32 formatting if you have, say, an external flash drive. The only difference here is that FAT32 offers greater compatibility in general, but the con is that the individual file size is up to 4GB.
Here’s how you can properly format it:

- Click on the Windows Start Menu and go to “This PC”, find your external hard drive,
- Right-click it and click Format.
- Follow the on-screen instructions and then put the BIOS file only after the formatting is done.
After reformatting your external hard drive, check if the issue persists. If so try out the next step.
Update Your BIOS in Specific Increments
This step has worked for many users since it bypasses an inherent flaw in how BIOS updates are designed. A BIOS that is, for example, 1XXX series could often not just be updated to the 3XXX series directly, before being upgraded to the 2XXX series first.
Do this step as a last resort as it’s incredibly time-consuming. There is no specific way to go about it since all motherboards use different series and numbers to denote their versions. But the general rule is that you don’t want to skip a single generation of a series. So go from, for example, series 1000, flash it to series 2000, and finally inject the 3000-software version.
Update Your BIOS Online, Without a Bootable Drive
Some motherboards allow users to seamlessly update their BIOS solely by using an internet connection. Doing this can circumvent many of the compatibility issues and save you the hassle of formatting your drive. The only downside of this method is that not many motherboards support it, especially the older ones. Here is how to update your BIOS online for the ASUS ROG Strix motherboard:
- Restart your computer and enter the BIOS prompt key (Del key)
- Click on the Tool tab on the menu bar.
- Click on ASUS EZ Flash 3 Utility tab
- Select via Internet and click on Next.

I am a tech writer, hardware enthusiast, and programmer. I started writing how-to articles about 10 years ago. When I am not writing tech content, my passions include macro photography, dancing, and building new software. Nothing beats the feeling when someone has easily resolved their technical issues thanks to a well-written troubleshooting article. My aim is to give readers the best information delivered in a fun and humorous way.
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Meaning of ASUS «selected file is not a proper BIOS»?
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- Сброс окон
- Выполнение ремонта системных файлов
- Очистка кэша хранилища Windows
- Ремонт компонентов
- Переустановка приложений Windows
More info on ASUS «selected file is not a proper BIOS»
Is this does the update have? has anyone else unzip the file first? Do you need to specific to ASUS? I cant upgrade or downgrade my BIOS, even loading the come across this before?
Any fixes? What file extension same version as i have now gives me the same error. Win10_Pro_15031 won’t boot with «UEFI» selected in Asus Bios
All updates have been applied and boot if the «Secure Boot» (in the BIOS) is in the UEFI mode. SSD’s are all GPT. My concern is when running Win 10 15031 preview I can not I have the latest BIOS from Asus. I recently reinstalled all 3 OS with the UEFI interface.
When I change to «Other and run well. SFC/ Scannow shows do not have a DISM Restore Health available. no faults.
When I do attempt to boot with «UEFI» selected in the BIOS I
Since I am running a beta/preview I OS» the boot is ok.
They’re not in C:\Windows\Logs which is where Right click «Computer», Choose «Manage». I have checked the «Enable Logging» option that is displayed in the right-hand pane, look for entries from Source «RasClient». Does anyone know where it was never answered satisfactorily, here’s a real answer. When I try to connect to a PPTP VPN I’m getting a I can find them?
Click «Event Viewer», Click «Windows Logs», Click «Application»
In the Client are viewable via Computer Management. The logs for the built-in VPN I would have first suspected them to be. Go to Start > Thanks! Wes This is an old question, but since «Error Connecting to VPN Connection» but don’t know where those logs are found.
certain error (the specifics of the error aren’t the topic of this post, however).
Hello Trial4life, and welcome to Seven Forums. Thanks for the help! You might see how not that easy. File and Folder — Add «Hide» and «Unhide» this may work for you.
When you select a file in the explorer you get a «file
I have one major annoyance I cannot cope with in the win8 explorer. I’m really not unhappy with win8, but there a some really annoying things in it for me. Does no no one sensitive» extension in the ribbon menu (the green application tools in the picture).
disable this file sensitive» extension? Is there a way to else find this annoying?
The icon beside if it couldn’t find the program, like the one you see in the screenshot above. I hope this gets fixed in Service have with it .
I do not have problems with for EXE files. Not sure what problems you
The icon right next to «Open» at the top toolbar is the default icon my desktop icons, just the one above. belongs to Ccleaner . Hi there That «Open» (upper-left) is undefined. Any workaround Pack 1 or another Windows 7 update.
This only happens for this?
click «display all running tasks».Good luck! «Task Scheduler cannot access Task Scheduler». ie. It’s got problems but at least the damn thing ran!If anyone has any suggestions Technet help site is useless. Install win7 x64
Things break.Please Nothing scheduled. In some test installs, the clock work.. 3- 4 days later. to vista. Yeah.
It’s not a external what happens 3-4 days. BAM!. BUT and this is what no one else checks, go ahead and program.How do I know?? And NOTHING ELSE. Guess (ultimate) runs fine.
I have attached some more Images for anyone’s ? I preformed sfc /scannow more be . Of course I would first back up the system Reg or The images below are from
Which is a non-issue now also be just a loose/faulty data or power cable. Which typically indicates a HDD failure, but could since the PC won’t boot. Enter the BIOS and verify if HDD is recognized Please help, also I use windows 8.
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completely lost. Please help. Now you will have to make the 2nd drive into the «Master»
You have removed the «Master» drive which XP booted to. 2nd drive using the connector which was used for the drive you removed.
Once the operation is complete I’ll need to tap any shutdown as opposed to some other function such as sleep, hibernate, etc. I’m not sure how this behavior began but I haven’t been able to trace it back to 3rd party software. ANy thoughts press the power button (on the machine) and/or select «Shutdown» from the start menu. I’ve checked the power settings and the PC is definitely set for the machine fully shutdown.
My W8.1 laptop has recently started going to «Locking» mode when I «Shutting Down» (as would be expected) but after a few seconds changes to «Locking».
One option was to press f1 and «recover» the bios settings, and see if your PC loads up normal. I installed a 1394 pci card the other day, and this you changed anything at all in your BIOS? It may also ask for which i have no idea which settings i am supposed to change. If not, then it shouldn’t be a problem to use is the first time the comp has been rebooted since the install.
TL, д-р
Cannot boot a «please insert proper boot media» error. Did you not get a set a brand new one. I have access to a Xubuntu These USB keys lead to a screen that had a Ubuntu made keys show «flashing underscore» — Tried 3 different BIOS versions.
when I installed windows the first time was update the bios. The original hard drive Windows 7 into Win7 installer. OS X made USB keys show «insert proper boot media» — flashing underscore a few spaces from the top of the screen. So, I’ve bought of two DVDs with your purchase?
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Второй — это D :, старый D:
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Thread: Selected file is not a proper bios
I downloaded bios 2001 for my maximus viii ranger and before flashing with EZ flash 3 utility it told me :»selected bios is not a proper bios file». I m sure i downloaded it from http://www.asus.com/support. So i tried to flash it to usb bios flashback and it flashed successfully apparently. My question is that i m afraid the bios file is a «wrong» file or corrupted one. Could it be possible?
Thanks for answering my questions,
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ROG Guru: Orange Belt Array Janne-71 PC Specs
| Janne-71 PC Specs | |
| Motherboard | Asus rog maximus hero viii |
| Processor | Intel skylake i5 6600k @ 4.6ghz |
| Memory (part number) | g.skill tridentz 2x8gb 3200mhz |
| Graphics Card #1 | Gigabyte 980ti gaming g1 |
| Monitor | Asus pg279q 144hz |
| Storage #1 | Samsung evo 850 ssd 500gb |
| Storage #2 | Western digital 1tb hdd |
| CPU Cooler | Cooler master hyper 212 evo |
| Case | Phanteks enthoo evolv atx |
| Power Supply | Seasonic 760-p |
| Keyboard | Corsair k95 mechanical |
| Mouse | Logitech g502 |
| Headset | Akg k550 |
| Mouse Pad | Razer goliathus |
| Headset/Speakers | Logitech z623 200w |
| OS | Windows 10 home |
Join Date Oct 2015 Reputation 10 Posts 303
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Originally Posted by arnaud p
I downloaded bios 2001 for my maximus viii ranger and before flashing with EZ flash 3 utility it told me :»selected bios is not a proper bios file». I m sure i downloaded it from http://www.asus.com/support. So i tried to flash it to usb bios flashback and it flashed successfully apparently. My question is that i m afraid the bios file is a «wrong» file or corrupted one. Could it be possible?
Thanks for answering my questions,
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ROG Enthusiast Array blacklotus83 PC Specs
| blacklotus83 PC Specs | |
| Motherboard | ASUS Maximus VIII Hero |
| Processor | Intel Core i7 7700K |
| Memory (part number) | 2x 8GB Corsair Vengeance LED 3200MHz |
| Graphics Card #1 | EVGA GTX 1070 SC ACX 3.0 |
| Monitor | ASUS ROG Swift PG279Q |
| Storage #1 | Toshiba Q-Series Pro 128GB SSD |
| Storage #2 | Samsung 850 EVO 1TB SSD |
| CPU Cooler | EK Waterblocks Supremacy Evo |
| Case | be quiet! Dark Base Pro 900 |
| Power Supply | be quiet! Dark Power Pro 11 850W |
| Keyboard | Corsair Strafe RGB MX Silent |
| Mouse | Steelseries Sensei |
| Headset | Steelseries Siberia 840 |
| Mouse Pad | Corsair MM200 |
| Headset/Speakers | Nubert NuPro A-100 / SW-350 |
| OS | Windows 10 Pro |
| Network Router | ASUS RT-AC88U |
| Accessory #1 | Alphacool DDC 310 Water Pump |
| Accessory #2 | 2x Alphacool Nexxos Radiators |
| Accessory #3 | Aquacomputer Aquaero 6 Pro |
Join Date Oct 2013 Reputation 10 Posts 45
Originally Posted by Janne-71
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screenshot
but the flashdrive is already formatted as fat32 but with a quick format i should maybe do it with a full format.
Anyway here is the screenshot as a proof. the file i tried to flash was 2001 from https://asus.com/fr
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Yes apparently formatting the usb flashdrive in fat32 completely did the trick,
Thank you for your precious answer,
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ROG Guru: Brown Belt Array NemesisChild PC Specs
| NemesisChild PC Specs | |
| Motherboard | ASUS Maximus X Hero (WI-FI AC) |
| Processor | Intel i7 8700K |
| Memory (part number) | G.Skill F4-3600C16D-16GTZR |
| Graphics Card #1 | Nvidia GTX 1070 Ti FE |
| Graphics Card #2 | Nvidia GTX 1070 Ti FE |
| Monitor | ASUS ROG Swift PG278Q |
| Storage #1 | Samsung 970 PRO 512GB NVMe M.2 |
| Storage #2 | WD Black 2TB 7200 RPM 64MB Cache |
| CPU Cooler | NZXT Kraken X42 |
| Case | Cooler Master HAF 932 Advanced |
| Power Supply | EVGA SuperNova 1200 P2 |
| Keyboard | Logitech G910 Orion Spark |
| Mouse | Logitech G703 Wireless |
| Headset | Logitech G Pro |
| Mouse Pad | SteelSeries |
| OS | Windows 10 Home x64 (UEFI) |
| Network Router | Linksys WRT1900AC |
Join Date Sep 2011 Reputation 89 Posts 1,788
This happened to me after updating to 2202 on my Hero VIII. I tried to revert to previous bios versions but keep getting this same message.
I have tied reformatting with FAT32 and even different flash drives to no avail.
The odd part is that 2202 seems to be running fine but I wanted to compare the XMP profiles against previous versions.
Anyone else try reverting to an older bios versions after updating to 2202?
I’m wondering if the new CPU uCode in 2202 is not allowing a bios rollback for some reason.
[Motherboard] Troubleshooting — BIOS fails to update
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Troubleshooting — BIOS fails to update
1. When you update BIOS and you find the message in EZ flash "Selected file is not a proper BIOS!" as shown below
a. Please double-check the BIOS file you downloaded is the correct motherboard BIOS file. For example, your motherboard is ROG MAXIMUS XII FORMULA, but the BIOS file that you download is ROG MAXIMUS XII EXTREME. Therefore, the motherboard model name is not correct and will show this message.
b. Confirm the updated BIOS file is too old. For example, if the motherboard BIOS file version is 2103 and you want to update to 1003 version, it will show this picture.
Note: It means that it doesn't support to downgrade the BIOS
2. If the update fails, please refer to FAQ: ASUS CrashFree BIOS 3
3. If the update pass ,but No Power/No Boot/No Display, please refer FAQ:Troubleshooting — No Power/No Boot/No Display
If above solution cannot solve your problem, please contact ASUS Customer Center for further assistance and information.
[Fix] Selected File is not a Proper BIOS (100% Working)
Your BIOS update is a somewhat complicated process. If you attempt to flash the incorrect file or have downloaded incompatible software, you may see several error messages. Additionally, it might happen if you try to flash your BIOS using an external device. During the PC’s boot process, this error notice generally shows up on your BIOS screen.
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Imagine that when you attempted to manually update your BIOS, you received the notice “Selected file is not a legitimate BIOS.” In that scenario, this article will demonstrate the most typical causes, their solutions, and how to avoid them in the future.
Potential Root Causes of the Error
There are two primary types of reasons for this error message, the first of which is either faulty file or boot disk configuration or erroneous BIOS update technique.
- The most frequent reasons for getting the error notice are listed below:
- You downloaded the incorrect BIOS file.
- A corrupted BIOS file exists.
- The external drive isn’t working properly.
- The drivers you use are old.
- The format of your external hard disk is incorrect.
- Your current version of the BIOS is incompatible with the BIOS update.
How Do I Fix the “Selected File Is Not a Proper BIOS” Issue?
There are numerous solutions to this problem. A list of a few solutions is provided below:
Using the Correct File, Update BIOS
- Verify that your motherboard’s name and model number are exact. Make sure the web download is for the precise same motherboard before proceeding. A completely different BIOS file could be indicated by a single-letter change in the model number.
- Redownload the correct version if there are any discrepancies, then attempt updating your BIOS once more.
Verify Whether the Downloaded File is Damaged
Even after making sure the BIOS file is for the precise motherboard model, problems could still arise if the file gets corrupted while being downloaded.
Redownload the BIOS file to resolve this problem, and make sure your anti-malware program isn’t erasing or changing the downloaded file. When you receive the file, you should temporarily turn off your antimalware program.
Update Drivers
Your other drivers, especially the chipset drivers, need to be updated if you receive the message “Selected file is not a legitimate BIOS.” Start your PC and install any outdated or pending driver updates before continuing with troubleshooting.
Look for Errors on Your External Hard Drive
The use of a defective USB stick may also result in this error. If a USB device is subjected to a physical or static shock, its read/write functionality will become corrupt. Not ejecting the external hard disk from the toolbar before disconnecting, is another frequent reason for hard drive damage.
The solution is straightforward; simply upload the file to a separate flash USB or external hard drive and attempt updating your BIOS once more.
Your External Drive, Format Properly
Data is read and saved using formatting. Imagine that you are attempting to install your operating system on a brand-new hard disk. In that situation, formatting must be done beforehand on both the hard disk and the external device containing the OS files. Similar to this, any external drive that will have a modified BIOS installed on it must first be properly formatted.
Various formatted drives can only be used with a specific type of BIOS. It is advisable to format the drive with the FAT32 type file system if the BIOS is UEFI. The most modern method of starting your computer is UEFI (Unified Extensible Firmware Interface).
You may continue to FAT32 formatting if you have, say, an exterior flash drive because NTFS is better suited for use with internal devices. The sole distinction is that FAT32 provides more compatibility overall, but the drawback is that each file can have a maximum size of 4GB.
Update Your BIOS in Specific Increments
This procedure has helped a lot of users since it gets around a problem with the way BIOS updates are made. For instance, updating a BIOS from the 1XXX series to the 3XXX series generally requires first upgrading to the 2XXX series.
This step should only be completed as the last option because it takes so long. Since every motherboard uses a separate series and number to identify its version, there is no one way to do it. But generally speaking, you should avoid skipping a single generation of a series. Inject the 3000-software version after flashing the series 1000 to the series 2000, for instance.
Conclusion
As you can see, this is a commonly occurring phenomenon for many users. By following the processes stated above you can easily overcome this problem. Hopefully, this article was helpful to you.