Question Restoring UEFI Boot from Legacy Boot

[Jayrod9121]

Recently upgraded the MOBO and CPU on my PC, no other changes to hardware. Was unable to boot using UEFI and enabled CSM/Legacy boot, which has allowed me to boot into my original Win10 SSD. Im trying to enable resizeable BAR in BIOS, which requires me to switch to UEFI Boot. Is there any way to fix or "reformat" my windows drive to be compatible with the UEFI boot mode? Preferably something that I can do from the current Legacy Boot as I dont have a separate rig to reformat my SSD with.

Specs:
MOBO: MSI B550 Tomahawk Max Wifi
CPU: Ryzen R9 5900x
GPU: Radeon RX 6700XT
RAM: 2x16 GB DDR4 Corsiar Vengeance Pro
PSU: EVGA Supernova 750W
Boot Drive: M.2 SSD Samsung 960 EVO (Win10 VER 22H2)

Old/Replaced Hardware:
MOBO: ASUS Strix Z270E
CPU: i5-7600k

 

[SkyNetRising]

Use mbr2gpt utility to convert OS drive from MBR to GPT style partitioning.
Then you can switch to UEFI mode.

Read instructions, how to use it.
https://learn.microsoft.com/en-us/windows/deployment/mbr-to-gpt

 

[rgd1101]

and backup your data just in case

 

[Jayrod9121]

Use mbr2gpt utility to convert OS drive from MBR to GPT style partitioning.
Then you can switch to UEFI mode.

Read instructions, how to use it.
https://learn.microsoft.com/en-us/windows/deployment/mbr-to-gpt

Followed the instructions, everything is working fine from UEFI Boot now. Including the re-BAR support I was looking for. Thanks!

 

[SkyNetRising]

Followed the instructions, everything is working fine from UEFI Boot now. Including the re-BAR support I was looking for. Thanks!

Great. 👍