Windows 10: USB Magically disappears when trying to boot in UEFI mode

Hey there! I'm currently trying to boot my USB it's Arch Linux and named SCSI DISK but it only detects it when it's in legacy mode, and I do not dare to boot into it because if I do, it boots into GRUB rescue mode and I need to remove the CMOS battery just to get into UEFI/BIOS Even if I press F2/Del/F12... You name it. This occured when I decided to run "sudo rm -rf / --no-preserve-root", don't ask me why I did that, is there anyway that I can do to save my laptop?VideoLaptop: Dell Vostro 5460* Moved from Community Center* OS assumed to be Windows 11

:)

 

Lenovo laptop isn't showing USB boot drive in UEFI boot mode

Hi EEEEEE8,

I am Dave, I will help you with this.

Do not change your BIOS from UEFI to Legacy, the currently installed operating system will not boot in that mode.

Is the USB you are using created for UEFI Mode, what OS are you trying to install and what method was used to create the USB?

In BIOS, in UEFI Mode, temporarily disable Secure Boot, does the USB boot option then appear?

 

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.

 

Failing to install Windows 10 in UEFI boot mode

Hi

I’ve been reading articles in this community and others the last couple of days and I’m getting more and more confused.

I have made my first build with the following equipment:

Asus Prime Z370-P (Bios version 1002x64, firmware 11.8.50.3470)

Intel Core i5 8400 2,8GHz

Samsung 860 EVO Series MZ-76E250B 250GB

and other..

I purchased a Windows 10 Home Eng Retail licence on USB directly from Microsoft.

When installing Win 10 it always ends up being installed in Legacy BIOS mode.

First time, I only followed the instructions on screed and had a successful installation, but in Legacy Bios mode.

The second time I made the following change the UEFI:

Boot\Secure boot\OS type = Windows UEFI mode

Installation was still being made in Legacy Bios mode.

Third time

Boot\Secure boot\OS type = Windows UEFI mode

When Win 10 installation started I entered the cmd prompt and made the following commands in order to change to gpt

Diskpart

List disk

Select disk 0

convert gpt

Exit

I then continued with Windows installation which still ended up in Legacy Bios mode.

I’m getting crazy and I don’t know what I’m going to do : (

What do I need to change in the UEFI?

What do I need to do to prepare the disk for UEFI mode?

Is my purchased Windows 10 USB key prepared for UEFI mode?

Can someone describe, step by step what I need to do?