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Warning, this is potentially a process that may make your computer unbootable if done incorrectly, or if your BIOS doesn't support booting from UEFI. You should make a drive backup first.
Verify the computer supports UEFI/Secure boot before starting. Boot from a different system, or from a Win10 USB installer, into recovery mode then Command Prompt. You may need to change the disk number from 0, you can use diskpart to find out which is the right one. Copy to Clipboard
mbr2gpt.exe /validate /disk:0
Run Diskpart to find the disk number, change it in the below command if needed Copy to Clipboard
mbr2gpt.exe /convert /disk:0
Exit out, reboot, and set the computer to boot using UEFI/Secure Boot. This guide from Microsoft shows the steps to convert the boot method of your computer. https://answers.microsoft.com/en-us/windows/forum/all/convert-an-existing-windows-10-installation-from/aa8c2de3-460b-4a8c-b30b-641405f800d7 https://www.windowscentral.com/how-convert-mbr-disk-gpt-move-bios-uefi-windows-10 |