By Ivy / Last update July 22, 2021

Case: Windows 10 Bootable USB not working

Bootable USB is a media that contains everything required to boot Windows. Normally you can use it to start up your computer, whether it's bootable or not, and then clean install a fresh copy of Windows; perform in-place upgrade to Windows 10 from previous version; or troubleshoot a faulty computer. 

But sometimes you will find Windows 10 won't boot from USB drive, even no prompt, just like the following case.

I'm having problem with my Toshiba L875-S7308 where I cannot boot my USB while in UEFI mode.  I've formatted the USB (tried MBR and GPT), and restored the ISO using Windows 7 USB/DVD Download Tool. When I try booting from USB, the laptop ignores it and continues booting Windows. I've tried changing boot order, or manually selecting USB with no positive result. It seems like it's not even recognizing it (it's not showing the USB's name in the boot menu).

Windows 10 Bootable Usb Not Working

If you happen to be in a similar situation, you could stay for a while to learn more about Windows 10 bootable USB not working and then fix the error with given solutions. Also, you can choose to replace the corrupted or damaged bootable USB with an easier way. Please click the anchor text to get what you want quickly.

Why Windows 10 bootable USB not working?

Windows 10 bootable USB not working issue may be caused by wrong boot mode or file system. Specifically, most of the old computer models supports Legacy BIOS while the modern computer like Windows 8/10 uses UEFI boot mode. And usually, BIOS boot mode requires NTFS file system while UEFI (CSM disabled) requires FAT32.

There are some other reasons may cause Windows 10 not booting from USB, please refer to the following scenarios:

  • Bootable USB is not detected as a boot device. This means your USB stick is either corrupted or unbootable itself, or USB boot is not supported on the computer.¬†

  • Bootable USB not showing up in BIOS. This may happen because of incrrect boot order. By default, your computer only boot from the first boot option.¬†

  • Bootable USB not showing up in boot menu. This is because your USB drive is old USB 1.0 or 2.0, which is not supported by Windows 10.¬†

  • You can't boot from USB in Windows 10, not even select the right boot option. In this case, the USB drive is likely to be damaged or corrupted. You may receive error message like "no bootable devices found".

Now, I'll provide the approaches to check and fix the problem.

How do I know if my USB drive is bootable in Windows 10?

The Windows boot USB not working issue could be caused by computer configuration or the USB drive itself. To fix it effectively, the first thing you need do is to check where the problem is coming from. 

Try this bootable USB on another PC that supports booting from USB. If it's bootable, this may be a configuration issue of your computer. Similarly, you can use a different USB boot drive on your PC to see if it's bootable. If yes, then the problem may be caused by your own USB drive. 

To boot computer from the bootable USB, you can use Windows 10 quick boot menu "Use a device" without changing the startup sequence in the BIOS. But if you cannot see this option in the recovery environment, please manually change boot order and then boot.

Boot from quick boot menu - Use a device

Step 1. Press and hold the "Shift" key while clicking "Restart" button. Then, your computer will reboot to the Advanced Startup Options screen, click "Use a device". 

Use A Device

Step 2. Select the boot USB drive, wait and see if your computer boot from this drive.

Manually change boot order - set boot priority to USB drive

Step 1. Shutdown your computer and then start it.

Step 2. Press a specific key when you see a prompt at the first boot screen, like this, "Press ESC to enter BIOS". Also, if your computer is fast boot mode, you don't need to press any key.

Step 3. Go to the "Boot" tab and use the up arrow to move the USB drive to the top. 

Step 4. Press "F10" to save changes and restart your computer with USB dive. 

Windows 10 not booting from USB - how to fix?

Before you start, you need to know that USB drive as a boot option is supported in newer OS like Windows 8/10. But if the flash drive itself is not actually bootable, your computer will try to boot from the next bootable device in the priority boot sequence of BIOS.  This is why your computer continue to boot Windows without any prompts. 

Then, continue to learn how to fix Windows 10 bootable USB is not working.

Fix 1: Make Sure the file system of USB drive is formatted as FAT32

Format the drive with NTFS file system if the computer is Legacy BIOS mode. Meanwhile, format your USB with FAT32 if your computer boot mode is UEFI.

To format the USB drive, please press "Windows + E" to open file explore, right-click the USB drive and select "Format", then select FAT32(Default) file system and click "Start" to begin.

Format Usb To Fat32

Also, you can format USB flash drive to FAT32 using Diskpart. To open it, run cmd as administrator, type diskpart in the command prompt, and input the following commands subseqently.

‚Ė™ list disk
‚Ė™ select disk n (‚Äún‚ÄĚ refers to the disk number of the USB flash drive that you want to format)
‚Ė™ list partition
‚Ė™ select partition m (‚Äúm‚ÄĚ is the USB flash drive partition number)
‚Ė™ format fs=fat32 quick

Fix 2. Be sure the USB drive is set to be the first boot option

You can restart your computer, press the key (eg: F2, F11, ESC) on the first screen to enter BIOS, find out Boot Options or something like that and set boot priority to USB drive. 

Check USB BIOS

Note: If you cannot see the USB boot option, your computer may not support this option. You need to try different ways.

Fix 3. Enable CSM or Legacy boot mode, and disable Secure Boot Control

You can enter the BIOS screen and click Boot > Launch CSM and enable it. Next, click Security > Secure Boot Control and disable it.

Enable CSM

Fix 4. Change UEFI or Legacy BIOS boot mode 

You can enter BISO screen and click UEFI/BIOS Boot Mode or Launch Storage OpROM Policy, then select the right mode. If the bootable drive is FAT32, select UEFI. But if it's NTFS, please choose Legacy. 

Uefi Bios Boot Mode

Fix 5: Create a bootable USB with Windows media creation tool

Up still now, if you don't fix Windows 10 bootable USB not detected or showing up via the given solutions, you can choose to create an installation disc with Windows 10 media creation tool provided by Microsoft's official website, or create a bootable USB drive with built-in recovery drive (for detailed steps, see Windows 10 recovery disk). 

To create a bootable USB drive with media creation tool, you need to download it first and then launch, select "Create installation media for another PC" and follow the on-screen instructions to complete this task.

Create Installation Media

Now, you may already fix this error and have a bootable USB drive, so you can start to check if you can boot from USB in Windows 10 and then repair Windows 10 with bootable USB. The following is a simple guide for you.

1. Connect the bootable USB and set boot priority in the BIOS.

2. After the Windows files loading is completed, click Next until you see "Repair your computer" and tap on it. 

3. Click "Troubleshoot" -> "Advanced options" and then you will see several recovery tools. You can select one among them and follow the instructions to start repair.

Repair Windows 10 with Bootable USB

Also, you can install SSD on Windows 10 with bootable USB, but the steps are slightly different. After booting from USB, you click "Install Now" instead of "Repair your computer" on the first Windows Setup interface. Then, just follow the prompt of clean installation wizard.

Easier way to create Windows 10 bootable USB  

Actually, bootable USB drive or installation media is designed to help you reinstall Windows or repair computer issues. But this process is painful, especially for the novices who are not familar with these operations. What's worse, reinstalling will remove everything on the system partition and leave only a clean OS.

In this case, you may want a different kind of bootable USB, which can help you get your computer back to earlier state while keeping all the data safe. To make it happen, you could try a simple yet powerful media creation tool - AOMEI Backupper Standard.

It supports all file system including FAT32/FAT16/NTFS/EXT2 etc, and Windows OS like Windows 10/8/7/XP/Vista. You can create a bootable media with any kind of file system and use it to boot all of the Windows system without boot issue. And the created media is compatible with both legacy/MBR and UEFI/GPT.

Well then, let's get started to create a universal bootable USB with AOMEI Backupper Standard. 

Step 1. Download the freeware, install and launch it. Then click Create Bootable Media under the Tools tab.

Download Freeware Win 10/8.1/8/7/XP
Secure Download

Create Bootable Media

Except for bootable media creation, there is similar feature but it is more powerful, it's "PXE boot tool(supported by AOMEI Backupper Workstation)". It allows you to start multiple computers over network simultanously and then perform batch operations including backup, restore and maintainance. 

Step 2. Select Bootable Disc Type. It’s recommended to select Windows PE. This option is suitable for everyone and offers you more operations than Linux.

Windows Bootable Disc

Step 3. Tick USB Boot Device and then click Next to move on.

Select Usb Device

Step 4. Wait for the process and click Finish when it reaches to 100%.

Finish

From now on, you don't need to worry about this issue "computer won't boot from USB".

Notes:

  • To make sure you can restore your computer to an earlier date, you still need to create a system backup¬†or disk backup for your computer, which includes system partition and boot-related partition(s) to start Windows.
  • If your computer has failed to boot without any previous backup or bootable drive, you can also use AOMEI Backupper to create a bootable media and system backup on another working Windows 10 PC, then use them on the problematic computer to perform a¬†disimilar hardware restore.¬†¬†
  • If you don't have any USB or CD/DVD, you could consider adding a boot option of¬†recovery environment¬†using¬†AOMEI Backupper. It works just like bootable media, but only available on the current computer.

Recovery Environment Entry

Conclusion

That's all for Windows 10 bootable USB not working, you can choose to fix it with given solutions, or directly create a brand-new bootable USB to protect data and system on the computer. It saves the life of your computer even if it crashes. The premise is you have a working system image backup.

In a simple word, if you want to reinstall Windows 10 or repair it, the previous one is a better choice. But if you want a way to restore entire computer, including the system, all of personal data and programs, etc, you'd better use the latter one. 

It not only helps you create universal bootable device, but protect your data and system by its poweful backup and restore features, such as, backup system/disk/partition/file, incremental & differential backup, USB plug in, daily/weekly/monthly schedule backup, sync files between computer and flash drive, etc.