Windows 10: How do I switch from Legacy BIOS to UEFI?

Hello everyone,
I recently had an issue with my Sony Vaio SVJ202A11L where the config files were corrupted and decided that a clean install of Windows 10 was the best option. My device was using UEFI at the time and from the UEFI firmware UI I set the boot order to external device then hard drive in order to boot Windows from a Flash Drive. The OS wouldn't boot, however, and so I set the BIOS mode to Legacy (per something I read randomly on the internet). Everything booted after that and after deleting the old hard drive partitions and creating new ones with a MBR format, windows installed itself no problem. However, I'd like to switch back to UEFI. I tried using Windows MBR2GPT.exe and... the partitions reformatted but then I restarted the computer and the Legacy BIOS could no longer read the hard drive and went looking for an external drive and screaming "No Operating System Found_". I then did the whole thing over and installed Windows once more. I don't know where to go from here. I've read article after article on how to resolve this issue but while I can format drives and partitions just fine, how on earth to I switch back to UEFI?

:)

 

Legacy to UEFI

I'm debating moving to UEFI form my now legacy BIOS (Award Software Int.) the mother board is a GA-Z68XP-UD3 rev1.0 on the the following link it shows a UEFI BIOS U1J )UEFI BIOS)

GA-Z68XP-UD3 (rev. 1.0) | Motherboard - GIGABYTE Global

Currently I'm running the legacy F10 BIOS. Does installing the UEFI BIOS automatically take care of everything to get to the UEFI BIOS? Installing the UEFI BIOS following the instructions using the Q-flash method GIGABYTE How to Reflash Motherboard BIOS

What's steps do I take and in what order?

Much appreciated

 

Problem Regarding Bios Change from UEFI to Legacy

I have hp pavilion p045tx with windows 10 pro. I recently install Ubuntu with windows 10 so for that I convert my bios setting from UEFI to Legacy mode for install third party software like wireless Driver and all in Ubuntu.
But after every restart the bios setting change to default and that is to UEFI mode and that will cause an problem of no OS detect. Every time I have to go to bios setting and enable the legacy mode to start my OS. Can anyone suggest me what to do in this
case.

 

Return to Legacy from UEFI - BIOS

Hi There

A while ago I was helped here to change from Legacy to UEFI. However, since then it seems, the Laptop (Latutide E6420) is running a bit slowly which was otherwise very quick until then. Now, it takes nearly a minute or so to boot up or shut down or even
to close a file. Just a couple of days ago, I updated the latest BIOS for this machine recommended by Dell.

I tried to go back to Legacy but the system was asking me to reset to UEFI or face boot problems. One advise said that I could disable 'Secure Boot' in Boot Manager and reset to Legacy. However, the Boot Manager is listed under UEFI Boot process and it only
starts Windows. Is there any way as easy as I changed it? This is absolutely under the hope that all will be as normal as it was in the beginning. Please give your thoughts and advice. Thanks.