Convert Legacy BIOS to UEFI

1. To convert, you need to access Command Prompt from Windows advanced start-up. For that, press Win + X, go to “Shut down or sign out” and click on the “Restart” button while holding the Shift key.


2. The above action will reboot your system to the Advanced Start-up screen. Here, go to “Troubleshoot -> Advanced Options,” and select the option “Command Prompt.”


3. The first thing we need to do is validate the disk we are trying to convert. Type the below command and press Enter.

mbr2gpt /validate

If you see the “Validation completed successfully” message, then you can proceed to the next step. If you see any errors, your disk or system might not meet the conversion requirements.


4. After validating the disk, execute the below command.

mbr2gpt /convert

As soon as you execute, Windows 10 will start the conversion process, i.e. it will add all the required UEFI boot files and GPT components and then update the Boot Configuration Data.


5. Now restart your system, launch your motherboard firmware settings screen and change it from Legacy BIOS to UEFI. The procedure to change from Legacy BIOS to UEFI depends on your motherboard manufacturer. Consult the manual for the exact steps.

6. After booting into Windows 10, you can verify whether you are converted or not. Just like before, open the disk properties window from the Disk Management tool, and go to the “Volumes” tab. Here, you should see “GUID Partition Table (GPT)” next to “Partition style.”