Change the already installed Win 8.1 BIOS mode from Legacy to UEFI

Hey,
It seems that my Windows 8.1 is installed in BIOS mode: Legacy as "msinfo32.exe" shows. I can boot into it with no issue, but when I go to my laptop's BIOS settings and change the mode back to UEFI, it gives me an error "Operating system not
found" (not sure about the exact error message).
I am just wondering if it is possible to change the Windows 8.1 BIOS mode to UEFI so when I change the laptop's BIOS settings back to UEFI, it can boot into it?
Regards.

Hi Amin CiscoSoft,
Since UEFI mode need an EFI system partition (ESP) which has the partition type ef00, usually contains a FAT32 file system. We need to recreate the partitions needed for booting the installation media in UEFI mode.
Before you doing that we VERY recommended for you to read all contents including Prerequisites and warring paragraph in links below, then perform a backup of your data. If you have a second disk drive big enough, you can simply create a system image and
able to recover the full installation as it was before you started this procedure if anything goes wrong.
Since the steps are complicated, please follow the steps in
http://social.technet.microsoft.com/wiki/contents/articles/14286.converting-windows-bios-installation-to-uefi.aspx
Regards

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