Does Win 10 require UEFI?

No, Windows 10 will continue to support legacy BIOS. For new devices that are launched a year after the release of Windows 10, they must have UEFI and Secure Boot enabled at the factory. This does not affect existing systems.

Can you install Windows 10 without UEFI?

You can install Windows 10 without UEFI in Legacy/BIOS so no, it isn’t necessary. You couldn’t install it via the USB drive with UEFI enabled because your USB is formatted as NTFS.

Does Windows 10 need UEFI or Legacy?

In general, install Windows using the newer UEFI mode, as it includes more security features than the legacy BIOS mode. If you’re booting from a network that only supports BIOS, you’ll need to boot to legacy BIOS mode. After Windows is installed, the device boots automatically using the same mode it was installed with.

Is UEFI required?

Calling it a safety measure, Microsoft has now made it mandatory for PCs to have UEFI capability to install and run Windows 11. If your PC meets all other requirements, enabling UEFI Secure Boot (along with TPM 2.0) should make it possible for your PC to become Windows 11 compatible.