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Can't boot from usb flash drive


I turned my hard drive from MBR to GPT then I tried to boot in uefi mode but an error message appears say's there is no bootable device ,,although iam trying to boot from USB flash drive with win 10

what does this mean ?

Any help greatly appreciated

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you should press f12 as the logo appear.. then choose what kind of bootable you have its either usb or dvd disc. then enter after that press and hold fn and f10 together.. then the bootloader will poo up,, then press any key to proceed


I am ideapad 3-14iil05 laptop how to boot from a usb drive - thinkpad sir

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well i had the same problem!


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Chosen Solution

Hope This Helps-Calvin Mogilinski

1) Make sure that your USB bootable shows on a working computer before trying the new BIOS

2) CSM or Legacy selection are for booting Windows 7, I think, and the UEFI selection is for Windows 8.

3) when u start press F10/F11(or whatever key) for boot options and if u see categories as removable, hard , CD and etc. Don't choose removable, choose hard u will see your hard and USB stick


Windows 8 and higher OS uses UEFI mode and has GPT Disk Partition type by default. Therefore installing windows 7 and lower OS that is BIOS Based and uses MBR disk partition takes some proper configuration to be successful.

I ran into the same problem when I changed from Windows 10 (due to it's current flaw -the increased internet usage through background apps and system updates) to windows 7.

Although it is marked solved, I still have taken the time to add my solution hoping to help future readers of this thread.

UEFI has feature called safe boot which adds a extra layer of security to the loader and it prevents booting from external sources like bootable USB Drive or CD. Therefore even if you make a Bootable flashdrive or CD it won't show up on boot menu or booting process.


Backup all your necessary data to an External Disk Drive/Flash Drive/ or another Unit. Do not just backup on the same disk with different partition because you might end up deleting all current partitions on the disk to install a fresh copy of Windows 7. See note below.

What we can do:

Option 1.Disable Safe boot and change Boot Mode to CSM/Legacy BIOS Mode.

Option 2.Make a bootable USB Drive/CD that is acceptable/compatible to UEFI.


1st Option:

Disable Safe boot and change Boot Mode to CSM/Legacy BIOS Mode.

1. Load BIOS Settings page ((Head to BIOS Setting on your PC/Laptop which differs from different brands. Usually by striking [F2] key upon loading the unit and before the OS logo appears on the screen. Just search on net how to go to your BIOS settings based on your brand.)

2.Disable Safe boot option from BIOS security settings.

3.Find on your BIOS Settings about Boot Mode, change from UEFI(Unified Extensible Firmware Inferface) boot to CSM(Compability Support Mode)/Legacy BIOS mode boot. Remember that UEFI uses GPT partition type and CSM uses MBR. (Reference on GPT and CSM on link below)

4.a From BIOS Boot Order make the USB as the first priority/first boot.(Remember to revert this option after the installation to prevent future error when booting Unit with attached USB Drive on its port).


b. You may skip 4.a and just press the Boot Option Menu Key before OS logo appears during booting. It's usually [F8] or [F10] or [F11] or [F12] on the most brands. Then select USB from Boot menu from options.

5. Save and exit from bios

6. Boot from installer and Install OS.


If your current OS is windows 8 or higher, as I said it uses GPT partition type disk by default not MBR thus you need to make the Disk converted into MBR or erase All Partitions until the disk is fully unallocated (means losing all your precious files) then create new partitions for your windows 7 System and Data Drive.

2nd Option:

Make a bootable USB Drive/CD that is acceptable/compatible to UEFI.

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m.elsayed00 you need to go into the bios and change the settings to accept the USB drive . you will find it in boot options ( not 100 % sure on lenovo but most bios its found in the boot options) and will require you to change from legacy to EUFI If its already in eufi then switch back the other way . save your changes and then boot to the boot menu and select your drive which should now be visable. Hope this helps

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Thnx Jim for your reply but I had already done that and there is a message telling me there isn't bootable device also even when I choose my USB flash from fast boot or from legacy mode in BIOS and still not working I don't know why?!


how did you do that ?so weird,because on my lenovo t410 there is no uefi boot mode at all :-D


I had similar issue with a flash stick that I use fine for HP but Lenovo does not like it...Well the Stick I used was formatted NTFS but once I Formatted it FAT32 and it boot fine with the Lenovo.


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Finally what worked for me was using Option 1 and using the Rufus application to create a bootable USB. Previously used “Uiniversal USB installer” and it was giving be grub4dos error. I used Rufus and created an MBR partition type in USB and on reboot select EFI USB as device and from there followed the Ubuntu instructions for setup on a 25gb space.

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To enter the BIOS via the function key

Immediately press the F1 key 5-10 times after pressing the power button, or reboot the system and press F1 when the Lenovo logo is displayed.

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When you turn on your Lenovo computer, hit F11 real quick, it will take you into your bios. F1 and F10 take you into a bios, too, but you can’t do anything in there so I use F11. Once you are in your bios, just tell it to boot from your USB drive.

The other thing you need to do is connect your computer to a CAT 5 or Cat 6 cable. Once you connect, go to wireless networking, find your router on there, give it the password and connect. After that, disconnect your cat 5 or cat 6 cable. You should be connected, now.

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I found that running fdisk and then hitting w to "write" the configuration fixed a problem with the boot records. I had used dd to clone the Ubuntu 22.04.1 iso directly onto the usb key's block device. This drove me batty for about an hour in which I probably should have tested another working key or tested the broken key on another computer. I had developed a theory that Windows 11 was preventing boot from usb, but it only seems that it was booting and hiding the errors that occurred from the failed boot from usb.

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m.elsayed00 will be eternally grateful.
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