System fails to start into Windows following a switch between Legacy-UEFI and UEFI modes, then reverting the change.

F5F Stay Refreshed Hardware Desktop System fails to start into Windows following a switch between Legacy-UEFI and UEFI modes, then reverting the change.

elaydadon11
Junior Member

01-04-2021, 08:23 AM

I checked the update process for Windows 11 and the Health Check suggested enabling Secure Boot and TPM. I looked through an MSI support guide and a Windows Support article, which seemed clear. I switched the BIOS to UEFI-only and restarted, but when I tried to boot into Windows it wouldn’t start. I went back to Legacy-UEFI and still couldn’t launch Windows. The drives are detected but don’t appear as bootable, and all settings are set to defaults. Please let me know if I missed anything or if the solution is obvious—I’d really appreciate your assistance.

elaydadon11

01-04-2021, 08:23 AM #1

radpool97
Member

01-06-2021, 03:03 AM

To switch from legacy-UEFI to UEFI, first convert your boot drive from MBR to GPT. Details are discussed in the thread.

radpool97

01-06-2021, 03:03 AM #2

To switch from legacy-UEFI to UEFI, first convert your boot drive from MBR to GPT. Details are discussed in the thread.

Rei_Delta
Member

01-06-2021, 05:55 AM

You found the information but seem unsure about it. It appears you're having trouble accessing Windows and still can't start after restoring settings.

Rei_Delta

01-06-2021, 05:55 AM #3

You found the information but seem unsure about it. It appears you're having trouble accessing Windows and still can't start after restoring settings.

RaiZer_
Member

203

01-06-2021, 09:29 AM

Bump, maybe someone will assist you.

RaiZer_

01-06-2021, 09:29 AM #4

Bump, maybe someone will assist you.

Nasicas
Junior Member

01-06-2021, 10:48 AM

Keep an eye on it, it made a difference for me.

Nasicas

01-06-2021, 10:48 AM #5

Keep an eye on it, it made a difference for me.

yoyofinal
Junior Member

01-06-2021, 10:54 AM

Sure, I just completed the same action at that moment. Did you manage to figure it out?

yoyofinal

01-06-2021, 10:54 AM #6

Sure, I just completed the same action at that moment. Did you manage to figure it out?