Error BIOS/Legacy Boot of UEFI-Only Media: Try Powerful Tips

Resolve Rufus boot error: BIOS/Legacy starts UEFI dedicated media

When using Rufus to create a bootable USB disk to reinstall or completely install a Windows 11/10 system, you often encounter the "ERROR: BIOS/Legacy BOOT OF UEFI-ONLY MEDIA" error. This article will introduce two solutions provided by MiniTool.

Error message: BIOS/Legacy starts UEFI dedicated media

This error usually occurs on bootable USB drives created using the GPT partition scheme. The system prompts that the USB flash drive can only be started in UEFI mode, and you are trying to start in BIOS/Legacy mode.

Solution:

According to the error message, there are two main solutions:

Method 1: Start the USB drive in UEFI mode

Since the bootable USB flash drive is created using the GPT partition type, you need to change the BIOS boot mode to UEFI mode.

Most modern laptops and desktops support Legacy BIOS boot and UEFI boot. The method to change the startup mode is as follows:

Step 1: Connect the USB flash drive to the computer, restart the computer, and press F2, Del and other keys to enter the BIOS menu.

Step 2: Go to the "Boot" (or similar name) tab and enable UEFI boot mode (the option may be "UEFI/BIOS Mode" or "Boot Mode"). Sometimes it is necessary to disable Legacy startup support, and set "Legacy Support Mode", "CSM Support", or "Compatibility Support" to "Disabled".

Method 2: Recreate the bootable USB drive using the MBR partition scheme

If method one is invalid, you can try to recreate the bootable USB drive using the MBR partition scheme.

Step 1: Start Rufus and connect to the USB drive.

Step 2: Select the USB drive and Windows ISO file, select "MBR" as the partition plan, and select "BIOS (or UEFI-CSM)" in the "Target System". To configure other options, click "START", customize Windows installation, and then click "OK". After waiting for a while, you can get a bootable USB drive.

When booting with this USB flash drive, the "ERROR: BIOS/Legacy BOOT OF UEFI-ONLY MEDIA" error will no longer appear.

Summarize

Rufus boot errors are very frustrating, but luckily, they can be easily solved by both of the above methods. When you encounter an "ERROR: BIOS/Legacy BOOT OF UEFI-ONLY MEDIA" error, please follow the steps above.

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