Windows 10: How can I properly switch from Legacy to UEFI mode

I have been struggling a little bit while trying to switch from legacy to UEFI boot mode and needed help about it.


I've tried mbr2gpt but I got errors which were related to disk layoutpossibly because I have more than 3 primary partitions




I also had dual boot setup beforeUbuntu and Windows10 on this system which I removed later, the EFI volume H is marked as active from the time I had dual boot


Here is my current partition layout:




and the partitions mentioned in diskpartif required



Volumes:


System Specifications:




Sorry in advance if im missing some details, I'm new to the forums

:)

 

UEFI vs Legacy boot mode

Switching to UEFI bios on GPU does not enable UEFI mode if motherboard is set CSM = On. Setting CSM = Off in my experience causes Windows 7 issues, even if installed as UEFI mode with GPT partition on storage device.

 

UEFI vs Legacy boot mode

Yep, UEFI mode with Win 10 loading I get the Asus logo.

IIRC there maybe an option within motherboard UEFI to disable the Asus logo but not looked into it. On another forum I have read that what logo you get at Win 10 loading is the easiest way to know what bios mode OS is in.

If system is booting in legacy mode - you get Windows Logo.
If system is booting in UEFI mode - you get OEM logo.

Above also applies to Win 8 but not Win 7.

 

UEFI vs Legacy boot mode

I also recommend legacy mode. UEFI has to tight integration with the OS which is exactly the problem. There was a case where UEFI installed bloatware on fresh Windows installations automatically. It shouldn't be supposed to be able to do that unless the firmware was open-source.