Windows 10: In the UEFI/BIOS setting what boot option do I add to access Windows 10 from harddrive?

Settings, General, Boot Sequence.


Boot List Option has UEFI selected. I can click Add Boot Option, then click on File name and see a list of things.


Directories listed are boot, efi, sources, and support.


Files listed at the start are autorun.inf, bootmgr, bootmgr.efi, and setup.exe.


I don't know what the Bot Sequence was when I had it loading Windows 10 from my hard drive originally, before having to format everything and reinstall it.

:)

 

Accessing BIOS (UEFI Firmware Settings)

Frequently, PC users have difficulty entering BIOS on a fast boot computer using OEM instructions, e.g., esc + f10.

In Windows 10 one method of accessing the BIOS is from the Settings menu of Start as follows:



Settings > Update and Recovery > Recovery > Advanced start-up > Restart Now > Troubleshoot >
Advanced Options > UEFI Firmware Settings

 

UEFI boot options disappeared from BIOS; now getting reboot and select proper boot device

In short, I need to get the system/BIOS to allow UEFI booting of the SSD.

Computer started up today with default BIOS settings.

• Only SSD 1(Windows boot) and SSD 2 were listed in BIOS; HDD 1 and HDD 2 were not visible
• System would not boot. Gave the 'reboot and select proper boot device' message
• Boot menu has no UEFI/EFI (or Windows Boot Manager) entries anymore

I went into Partition Magic/Gparted and confirmed :

• All drives are still showing
• All drives' data is in tact [EFI volume/partition is still listed (and can be browsed/files accessible)]

Gparted print out (note dev/sda2 apparently that is normal behavior) :

/dev/sda1 (locked) EFI System Partition--Fat32--/media/sda1--100.00mb--46.81MiB--53.19MiB--boot,esp
/dev/sda2 (exclamation mark) Microsoft reserved partition--unknown file system--no mount point--128.00MiB--unused spaced--msftres
/dev/sda3 basic data partition--ntfs--/media/sda3--118.58GiB--70.78GiB--47.80GiB--msftdata
/dev/sda4--ntfs--/media/sda4--450.00MiB--327.71MiB--122.29MiB--hidden,diag



As I am able to boot Windows installation from USB, I tried the standard startup repair. It said it was not able to fix any problems.

Next I tried to repair the EFI with Diskpart in the shell:

• sel vol 1 (note that Diskpart states EFI partition is 'hidden')
• assign letter=z:
• cd /d z:\EFI\Microsoft\Boot\
• bootrec /fixboot
• bcdboot c:\Windows /l en-us /s vz /f ALL

It completed all tasks successfully. Unfortunately that did not work.

Other things I have tried :

• Removing CMOS battery and replacing with a new one - my HDD started showing up again after doing this.
• Using the old MBR commands(in hopes it would force the Windows startup repair to recognize and fix a problem)

bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd​

• Loaded BIOS 'optimized'/defaults (the system did this already once before, hence why I am in this situation, though doing it manually seemed like an option worth trying. Note that after doing this and restarting the system, HDD's stopped showing again)
• Removed new CMOS battery and left it out of the system for thirty minutes
• Formatted EFI and msftres partitions, then rebuilt the EFI boot records

In summary, am looking to force the BIOS to see the EFI partition on the SSD boot drive, as it is not an option any longer.

 

Boot to UEFI Firmware Settings from inside Windows 10


Hi Shawn

I have asus gl552jx machineand it is configured for uefi boot, but I am still not able to access the UEFI BIOS utility tool. When I do the above steps, I land on the normal BIOS configuration where I have only 1 boot option for windows.