This error is usually encountered by those who are trying to boot from a USB flash drive to install Windows. But instead of the usual start of the installation, you get the error "BIOS / LEGACY BOOT OF UEFI-ONLY MEDIA". Therefore, in this article I’ll tell you what caused the error and how to fix it.
Why am I getting this error?
Most modern PCs and laptops support two boot modes: UEFI (EFI) and Legacy (BIOS). When you create a bootable USB stick, you choose in which mode it should be created.
If you boot into Legacy mode from a USB flash drive recorded in UEFI mode, you will see the message “ERROR: BIOS / LEGACY BOOT OF UEFI-ONLY MEDIA”, and the explanation on the error screen suggests either changing the boot mode in the BIOS/UEFI settings of your computer , or overwrite the USB flash drive for a different boot mode.
Switch from Legacy to UEFI
I want to note right away that not all computers and laptops have such an opportunity. Older computers (2010-2012) may not support UEFI mode, which means that they can only boot in Legacy mode. Therefore, if you know that your computer or laptop doesn’t support UEFI, go straight to the second method of fixing the error.
To switch boot modes, you need to go into the BIOS.
Next, go to the "Boot" tab (the names may differ depending on the manufacturer and firmware version).
Find the option “Boot List Option” or "UEFI / BIOS Boot Mode” and change the value in it to UEFI.
Create Legacy Bootable USB Drive
If for some reason the previous solution is not suitable for your case, you can recreate the bootable USB flash drive so that it is prepared for Legacy mode. To do this, you can use the free utility Rufus.
To do this, in the section "Partition scheme" select MBR, and in the "Target system", select "BIOS (or UEFI-CSM)". After that we press "Start" and wait for the end of the process. Next, try to boot from the newly created bootable USB flash drive. Now there will be no error.
How do I fix BIOS legacy boot of UEFI only media?
For changing BIOS firmware,
Power on the PC.
Press F2 to boot into the BIOS.
Navigate to the Boot tab.
Locate Legacy and UEFI.
Disable Legacy and enable UEFI. Does Rufus work with UEFI?
You can use the Microsoft Media Creation Tool to download the files onto a removable storage with support for both firmware types (UEFI and legacy BIOS). Or you can use Rufus, a third-party tool that makes it easy to create a flash drive to install Windows with support for UEFI. How do I turn my legacy boot into UEFI?
In the BIOS Setup Utility, select Boot from the top menu bar. The Boot menu screen appears. Select the UEFI/BIOS Boot Mode field and use the +/- keys to change the setting to either UEFI or Legacy BIOS. To save changes and exit BIOS, press the F10 key. If you can't find the UEFI Firmware Settings in the BIOS menu, then here are some common reasons for this issue: Your PC's motherboard doesn't support UEFI. The Fast Startup function is disabling access to the UEFI Firmware Settings menu. Windows 10 was installed in Legacy Mode. How do I change Windows 10 from Legacy to UEFI?
Alternatively, you may run this command from within the recovery environment:
Boot to the Windows Recovery Environment and start the Command Prompt console: ...
Issue convert command: mbr2gpt.exe /convert.
Restart your computer and boot into your UEFI BIOS.
Change BIOS setting from Legacy to UEFI mode. How do I fix UEFI boot and startup?
Image result
Follow these steps:
Restart your computer.
Press the necessary key to open UEFI/EFI. The key depends on your PC manufacturer and PC model. ...
Once inside the UEFI/EFI setup menu, search for Secure Boot. ...
Make sure Secure Boot is either Disabled or Off.
Save these settings and exit the UEFI/EFI setup menu. Download Rufus application from: Rufus.
Partitioning scheme: Select GPT Partitioning scheme for UEFI here.
File system: Here you have to select NTFS. What is UEFI boot error?
In UEFI systems, the "no operating system" boot error (or linux startup "grub" menu disappeared ) usually means that the centos EFI boot entry in the NVRAM of the computer (not in the hard disk, but in the non volatile memory used by the firmware) has been lost or damaged in someway, or that it is not valid anymore due How do I fix UEFI no bootable device?
Press F2 key repeatedly and go to BIOS setup. Now go into main and F12 Boot Menu: Enable. Now to go Boot option/menu and change the boot mode from UEFI to Legacy. Can GPT use without UEFI?
The GUID Partition Table (GPT) was introduced as part of the Unified Extensible Firmware Interface (UEFI) initiative. So to use GPT partitioning style the motherboard should support UEFI mechanism. As your motherboard does not support UEFI, it is not possible to use GPT partitioning style on the hard disk Does USB have MBR?
Every USB drive has a Master Boot Record. MBR contains Partition Table. While on a normal HDD, The MBR can have 4 partitions and the MBR has information about the partitions.