Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [efi]

EFI stands for Extensible Firmware Interface, and is an updated version of BIOS. It sits between firmware and the operating system in the software stack.

0
votes
1answer
18 views

Bootloader behavior when 2 OSs are installed on 2 separate storage devices - UEFI

I have a PC with Windows 7 installed on M.2 NVMe SSD (UEFI Boot). There's no way to disable this M.2 SSD in BIOS. MSI AM4 board. Same PC also has a 500 GB SATA HDD. I want to install Windows 10 on ...
1
vote
0answers
28 views

Cannot repair bcd because the windows installation cannot be found

I'm trying to rebuild my BCD but my windows7 installation cannot be found. So far, I have typed these commands from the Windows7 install DVD (which I booted in UEFI mode) : X:\sources>chkdsk /r c:...
0
votes
0answers
8 views

EFI sig list converter or viewer

I recently used efitools’ keytool.efi to save the efi secure boot keys from my bios. I now have a few .esl files that contain efi signature lists, but they are binaries. I would like to take a look at ...
-2
votes
0answers
17 views

Why windows always replace efi partitions with grub2 multi boot?

I have strange situations on multiboot system: GPT disk {debian,efi,windows} Debian boot from efi partition and has grub2 menu with entry: debian 9 and windows 10, and i cat boot in any os in first ...
1
vote
2answers
33 views

How do I find out which EFI system partition is in use by Windows 10?

I was running a dual boot Windows 10 / Linux system for some time, but I have recently decided to remove the Linux partition. Currently, I'm successfully booting and running Windows 10, however when ...
0
votes
0answers
14 views

EFI fails to load anything after Linux failed install, adding EFI entries does not persist

I have a Lenovo Yoga 510-14AST. I tried to install CentOS and now Windows would not boot (Initially CentOS would boot in non-UEFI mode, but grub ould not load Windows anyway and Windows is needed). I ...
0
votes
0answers
6 views

Can't boot Efi shell from usb drive

I downloaded an EFI shell from then moved it into a usb flash drive in the folder /efi/boot however when I try to boot from that drive it gives me the "an operating system was not found" error then ...
0
votes
1answer
20 views

Recover UEFI boot of Windows 10 after failed Linux install

So I have tried to install CentOS on a laptop with existing Windows 10, after freeing some space by shrinking Windows parttion inside Windows. But, while it did boot up, it moved the system no non-EFI ...
1
vote
0answers
12 views

rEFInd Shows No Boot Options

The grey screen with the rEFInd Boot Management banner comes up but with no entries. Computer is a Dell Inspiron 7573. I've had rEFInd working successfully on a self-built desktop and a 2014 MBP ...
1
vote
1answer
41 views

access denied with bootrec /fixboot

I got a new SSD for my windows 10 home desktop computer recently. I used macrium to clone the HDD -> SSD and changed bios to boot from SSD. But when I tried cleaning the HDD I somehow corrupted ...
0
votes
0answers
15 views

Can't locate Debian in efi folder (Windows 10/deepin dual boot)

I deleted a partition in Windows 10 to remove deepin distro. Now, when I attempt to launch Windows, I receive the 3F0 error. I made some progress in the command prompt to locate/remove the Debian file,...
0
votes
1answer
70 views

What file should I go for, bootx64.efi? Or bootmgr.efi?

I am going to do a clean install of windows 10 using usb stick. I followed the instruction successfully make a usb installation media. In the usb drive, you can see there is a bootmrg.efi file and ...
1
vote
1answer
52 views

Convert disk from UEFI boot to BIOS boot

I have a disk with a Windows 10 installation on a laptop that has suffered an unfortunate accident. I know the hard disk is still good, and now I'd like to move this disk, including the existing ...
0
votes
0answers
18 views

EFI Partition required or not required

Laptop OS got corrupt, could not boot. somehow recovered data. There are multiple partitions and 1 being Sony Boot partition. I want to delete all partitions and have 3 partitions, 1 for OS and other ...
0
votes
1answer
27 views

Windows 10 won't boot after moving EFI partition

On dualboot, I had two EFI partitions on two drives. One drive with EFI partition for GNU/Linux, second drive and EFI partition for Windows. I moved Windows boot files from second EFI partition to ...

15 30 50 per page