Some days ago, I installed Windows 10 to a new HDD. Afterwards, I found two boot options in firmware: (1) HDD, (2) UEFI - HDD. I thought the former is boot in legacy mode, the latter is boot in UEFI mode. I tried both and could boot to Windows.
Since then, I installed another OS & moved the files inside the EFI system partition (ESP) & reverted back... I forgot what I did exactly. Now, the firmware shows (1) HDD, (2) Windows - HDD. Option 2 can boot to Windows. But when I select Option 1, the system halts in blank screen. I think that means Windows can boot in UEFI but not legacy mode now.
Is it possible to make Windows bootable in both UEFI and legacy mode at this moment, without losing data?