Windows 10: Anyone know how to restore the boot partition on a uefi system?

Let's just say I accidentally overwritten it while reinstalling my linux distro.

I couldn't find any relevant guides, and I have no experience with diskpart and the windows tools.

I can still access the OS because systemd-boot has the Microsoft boot files backed up in /efi/boot

submitted by /u/A_Random_Lantern
[link] [comments]

:)

 

Partition resized, Windows 8.1 not booting, UEFI

Hi all,

Ok, I have a new lenovo ideapad 305 (system is UEFI boot), I used minitool partition wizard to resize the c: & d: drives (to increase space on the D) but didn't touch anything else, rebooted into windows & it seemed nothing had changed, so I booted up by USB and the partitions were exactly what I had changed them to. Thinking this was really weird, I tried rebooting & have not been able to get into windows since.
I have tried recovery through the windows 8.1 cd but it does not recognise the partitions at all! So I can't even use diskpart or the like, I have tried several boot recovery tools, some see the partitions & some don't, so I guess I need to make the partitions UEFI-enabled? I'm not fully savvy with UEFI & I've tried every piece of advice I could find, but i'm stuck, any clues?

Thanks for any help!

 

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.

 

Can't boot Windows 10, UEFI bootloader GPT partitioned system drive. Tried bootrec (Total identified Windows installations: 0)

Hi, I am trying to help a friend repair her son's computer so I don't have a lot of context as to what happened prior to this issue, but I will try to be as comprehensive as I can in describing what steps I've taken so far.

Initial Observations

This is a Windows 10 PC, with a 2 TB disk. It is UEFI enabled and GPT partitioned. Computer boots up and immediately begins
Preparing Automatic Repair. The computer reboots without going to the Choose an option menu and boot-loops through this sequence.

Method 1

• F11 to force boot options menu
• Boot into local disk recovery partition
• Launch cmd prompt in recovery environment
• Commands issued:
  • bootrec /fixboot
    • The operation completed successfully.
  • bootrec /rebuildbcd
    • OUTPUT: Total identified Windows installations: 0

Method 2

• Created recovery drive on my own Windows 10 PC
• Booted problem PC with the recovery drive
• Attempted startup repair multiple times (no luck)
• Attempted bootrec commands again (no luck)

Method 3

I attempted the solution suggested
HERE. At step 5, I got this error:

Path not found - C:\boot

So I changed the operations for steps 5 & 6 to target the system recovery volume on the disk: