Question Can't boot Windows 10 in UEFI mode ?

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Aug 31, 2021
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the format of your ssd right now, being MBR, has no effect at all on the ability of PC to boot off a USB. the reason I showed link was to point out what you should click in Boot Priority to boot USB.

where did you get ISO from? did you make it using the Media Creation tool?

You should have used Media creation tool to make USB as that Installer supports both UEFI and CSM boot so it should have worked.
I got iso from windows media creation tool and the rufus it to usb.
 
Aug 31, 2021
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You're doing something wrong.
UEFI installation media should be partitioned in GPT with single FAT32 partition.
Rufus way worked cause I installed windows 10 on hp 250 g6 in UEFI mode. Like I said, It was so easy, enter the bios, disabled secure boot, deleted platform key, and boom. Later after installation, I enabled secure boot again with no problem
 

lance88

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Aug 4, 2015
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If your drive is MBR and need to convert to GPT in order to use in UEFI, you dont have to reinstall the entire disk

https://docs.microsoft.com/de-de/windows/deployment/mbr-to-gpt?ranMID=46131&ranEAID=kXQk6*ivFEQ&ranSiteID=kXQk6.ivFEQ-HYF4.x9QUSSl6AxR2Zv4Jw&epi=kXQk6.ivFEQ-HYF4.x9QUSSl6AxR2Zv4Jw&irgwc=1&OCID=AID2200057_aff_7806_1243925&tduid=(ir__tiiqswk92ckf60gaiyumtzj9rf2xra91rkcamwya00)(7806)(1243925)(kXQk6.ivFEQ-HYF4.x9QUSSl6AxR2Zv4Jw)()&irclickid=_tiiqswk92ckf60gaiyumtzj9rf2xra91rkcamwya00

Checks if your drive is MBR format

Follow the link to convert MBR to GPT, you will need to use /allowFullOS to work.

You can specific the disk number if its not 0. Eg, mbr2gpt /validate /disk:0 /allowFullOS

Once completed, restart and boot immediately into bios page and change boot mode to UEFI and viola.
 
Aug 31, 2021
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No, thing is, even if I want to reinstall OS, I can not. I can't explain it more clearly. USB, FAT32, UEFI non CSM. Bios -> CSM Off, PK Enroled, Secure Boot Enabled, Windows UEFI boot mode. It simply won't boot into windows setup. MBR disk shouldn't make any problems. In fact, I've tried with some old sata hdd, converted it to gpt, and still can't boot from USB. I am assuming that my motherboard is faulty.

So with all of this said, I don't want to reformat my disk into gpt because it most likely won't boot anymore into windows.
 

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