This is because your USB drive is old USB 1.0 or 2.0, which is not supported by Windows 10. By default, your computer only boot from the first boot option.īootable USB not showing up in boot menu. This may happen because of incrrect boot order. This means your USB stick is either corrupted or unbootable itself, or USB boot is not supported on the computer.īootable USB not showing up in BIOS. There are some other reasons may cause Windows 10 not booting from USB, please refer to the following scenarios:īootable USB is not detected as a boot device. And usually, BIOS boot mode requires NTFS file system while UEFI (CSM disabled) requires FAT32. Specifically, most of the old computer models supports Legacy BIOS while the modern computer like Windows 8/10 uses UEFI boot mode. Windows 10 bootable USB not working issue may be caused by wrong boot mode or file system.
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