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.

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Two EFI Boot images showing up

I made a Bootable usb stick with linux mint using terminal with the dd command. When I boot my mac and hold the alt key I see my Macintosh HD and I see two times an EFI Boot. Can it be I did something ...
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Install Windows 10 on an EFI / hybrid MBR Macbook?

I have an 2011 macbook which has been updated to EFI 1.7. Bootcamp sets up a hybrid MBR to support Windows 7. I need to install Windows 10 on this hybrid MBR setup instead of an EFI/GPT setup ...
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15 views

Mac and EFI secure boot

I've recently had a linux live USB completely fail to boot on a mac running El Capitan, which makes me suspect secure boot is rearing its ugly head in the Apple world, as well as the PC world. So my ...
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22 views

UEFI Linux Installation To External Flash Drive

Recently I've bought myself a "Mini-PC" box that came with Windows 10. It only supports UEFI boot (no BIOS). Eager to play with Linux Mint on the box, I've installed it in UEFI mode, making sure the ...
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69 views

*bcdboot* error code [c000003a]

An attempt to restore Windows 7 EFI boot record with bcdboot c:\Windows /l en-us /s f: failed with BFSVC: Failed to create a new system store. Status = [c000003a] Does anyone have a clue what this ...
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22 views

Boot Loaders deleted, How to restore EFI?

I accidentally deleted (Don't really know how) all of the boot entries that appeared on efibootmgr on a laptop that had no operative systems (I did it from an Ubuntu Live USB). Now, when i try to ...
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16 views

Booting linux from grub2 gets kernel panic - root=null

I'm doing my own homebrewed version of linux. The distro works fine but I need to update it to use EFI and GPT partitions. My problem now is that I can't for the life of me get grub2 to boot it. I ...
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47 views

EFI Boot Grub on USB Stick

I'm trying to install ParrotSec Linux on an MBR USB stick. The root folder in mounted on sdc5 and I have an ext2 partition on sdc3 containing grub configuration, vmlinux and initrd. I have another ...
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53 views

can't boot debian, can't change anything with efibootmgr

After a kernel update (Debian Stable/Jessie), my system wouldn't boot. I got back into it by installing ubuntu, and the ubuntu loader will let me boot debian. So now I'm trying to get debian to ...
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31 views

Are there advantages to EFI for Linux guest in Virtualbox

I want to install guest Linux (Arch Linux to be exact) through Virtualbox. Virtualbox has optional EFI support, I'm wondering if enabling it provides any pros for linux guests or not.
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Installing Arch Linux- Do I need EFI?

I'm installing Arch Linux right now. I want to wipe the whole drive clean. However, there is a partition that is EFI. I don't know what to do with it. Can I delete it?
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My 3TB HD converted to EFI Partition

I have 3TB HD installed in my pc. I dont know how its converted to "EFI system partition" !! Can I return it back to normal patition without formating or cleaning it? This picture shows that disk 0 ...
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60 views

Recover windows 10 EFI Boot from dual boot with ubuntu

I made my window 10 system system in dual boot with ubuntu. I would like to remove ubuntu and install it in virtual-box within windows. I am afraid to remove ubuntu partions fearing windows may not ...
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1answer
17 views

How to specify a kernel to refind?

How to tell refind to load a specific kernel ? I got the following line : "linux" "rw nomodeset root=/dev/sda1 initrd=initrd.img" But how come that I don't have a kernel= parameter to tell what ...
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90 views

Why can't I load an EFI shell anywhere?

So I recently found out I had EFI instead of BIOS and went to experiment with different .efi programs to see which one I would want for full functionality. From 3 bootloaders I have used, I get the ...
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50 views

How do edit the contents of my BIOS boot list?

So the other day I installed Windows 7 on a GPT disk. It works fine. Today I went to boot off my Linux Live USB and I noticed Windows Boot Manager was in the list. I use a traditional BIOS and it ...
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22 views

Is it possible to update a LSI-9211-8i SAS HBA firmware without EFI?

I am trying to flash my LSI SAS HBA to IT mode from IR mode; I've heard this can't be done in the OS. My problem is that I am using a GA-EX58-UD4P motherboard, and it doesn't seem to know anything ...
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82 views

I created a Windows To Go hard drive and it requires legacy boot

I used AOMEI Partition Assistant Standard Edition 6.0 to create a Windows To Go hard drive (MBR, 4 partitions, Toshiba USB 3.0 v73600-H 2TB) Click for screenshot. I am able to boot to my hard ...
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55 views

EFI Shell: Volume is not mapped to filesystem

I got a MSI gaming 3 mainboard, SanDisk SSD 256GiB, Seagate HDD 1TB the mainboard automatically installed the efi shell v2.31 on my hdd /dev/sda1 after installing windows on the ssd and fedora on ...
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468 views

EFI dual boot windows 7 under fedora 23

I recently installed Fedora 23 on my Windows PC, which is running Win 7 Prof 64 bit. Before that I had a dual boot system with my above Win Sys and OpenSuse which was running after couple of minutes ...
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139 views

PreLoader.efi: What's wrong with my Secure Boot settings?

I installed Arch Linux with Secure Boot enabled using PreLoader. I enrolled the hash for loader.efi, containing rEFInd, and vmlinuz-linux using HashTools. The problem is that I get a message saying: ...
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27 views

How to install dualboot linux in efi with weird ssd

I'm trying to install linux on my efi computer but still not working. I first installed Windows with 120/510 GB disk in EFI mode, and then want to install linux but every single linux just doesn't ...
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55 views

Can a 64-bit OS be loaded on a 64-bit processor when the EFI is 32-bit?

I'm struggling to get a Chromebook loaded with a new OS. The Chromebook is a Toshiba CB35-B3330, and it has a 64-bit Intel Celeron N2840. I'm struggling because I can't get any useful information on ...
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113 views

How to add booting parameters to the kernel with bcfg from the EFI shell?

efibootmgr is creating invalid entries in the EFI boot menu. For instance efibootmgr -c -d /dev/sdX -p Y -l /EFI/refind/refind_x64.efi -L "rEFInd Boot Manager" adds an unbootable japanese characters ...
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51 views

How to launch vmlinuz-linux from efi shell?

How to start vmlinuz-linux from efi shell ? I jump into the ESP and type vmlinuz-linux (vmlinuz-linux is in the ESP) but it says vmlinuz-linux isn't recognized as an internal or external command, ...
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22 views

EFI Boot Shell Doesn't Work

Currently using an MSI Z97S (not sure if that matters), but when I try to boot into a Windows 10 USB, it skips it, and if I turn on Windows 10 mode, it goes straight to an EFI shell. I did look it up, ...
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169 views

Grub2 EFI falls to Grub Shell unless I hit F12 immediately after power on

I have Opensuse Tumbleweed together with Windows 10 on my Asus ROG laptop. The issue is quite weird - every time I power on or reboot, Grub2 EFI falls to grub2 shell and randomly it doesn't see the ...
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75 views

Correcting EFI boot entry for DVD drive to install Win 7 in EFI mode?

Running sudo efibootmgr -v on Kubuntu Trusty on my old Lenovo Z570 laptop gives the following output: BootCurrent: 0006 Timeout: 1 seconds BootOrder: 0006,0005,0003,0004,0007,0002 Boot0000 Setup ...
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26 views

partition resize breaks EFI USB installer

I have a 64GB GPT USB stick, containing EFI installer partitions for Windows 7, Windows 10, 5 linuxes, and a Clover BootLoader to launch an El Capitan installer for Hackintosh. It all works ...
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160 views

Repair an error:read-only efi partition

Again stumbling from one problem to the next. I recently installing OpenSuse13.2 parallel to win10. Worked nice. Then I decided to reintall, but Suse Leap, deleting the old Suse installation. At the ...
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60 views

Installing Debian but can't boot

I'm installing Debian testing on a SSD, there is a pre-existing EFI ESP partition from windows installation, the disk uses GPT partitioning. Problem is after it finishes installing it won't boot linux ...
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95 views

How to cleanup EFI boot list

I'm reinstalling my OSes multiple times trying to setup a dual boot and my motherboard boot list starts to get ugly : 2 entries Windows boot only one works, 2 entries for linux and none work. How to ...
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29 views

Can't boot Debian after forced EFI installation

I just installed Debian with encrypted /. I made a /boot partition and converted an NTFS partition to EFI. It installed but now I can't boot on Linux. My motherboard boot list put a mirrored "N" sign ...
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61 views

A UEFI entry is corrupt. How do I fix it?

I uninstalled Windows 10 from my triple boot setup to be left with dual boot but the UEFI entry for it stayed after I removed the drive, so to remove it I used easyUEFI to remove the entry but it just ...
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1answer
26 views

Add EFI stub to vmlinuz

Is it possible to add EFI stub to vmlinuz? I've been using ipxe for network booting installation images, problem is that in EFI mode ipxe is only able to boot newer kernels with EFI stub enabled. So ...
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17 views

Cancel Boot Camp automatic boot

I wanted to install Windows using Boot Camp, I gave it the ISO image and partitioned the disk but decided not to pursue after reboot. Now everytime I power up my MacBook Pro it automatically boots to ...
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31 views

Upgrading a USB installed Windows 10 on a Mac

I have Windows 10 installed on external SSD connected to my MacBook Pro 13 trough USB. I'm trying to upgrade Windows 10 and I keep getting an error "Windows can't be installed because this PC has an ...
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662 views

Multi-Boot: How to repair Windows 10 boot after Linux Mint upgrade?

I have an triple-booting iMac (Linux Mint, OSX, WINDOWS 10) with rEFInd installed. The following partitions listed using sudo gdisk -l in Linux Mint 17.3: Number Start (sector) End (sector) Size ...
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173 views

How to install Windows 10 after Debian

I want to install Windows 10 on my laptop with Debian Jessie on it. I installed my Debian in EFI mode with graphical options. Could someone point me to a good tutorial, what I have to set, what to ...
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100 views

Mactel Fedora 23 - Debugging Slow EFI Boot

I recently installed Fedora 23 on my Macbook4,1 (early 2008 model). After the white screen/apple sound at boot, I see a black screen with an underscore cursor for about 10-15 seconds before the Grub ...
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35 views

How to get config from a EFISTUB kernel?

I am working on getting normal Linux onto a x86 Android tablet. Only kernel I can find is efilinux.efi located inside the system’s ESP (\EFI\Intel\efilinux.efi). But I can’t get config through these ...
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61 views

Removing the EFI setup from the boot order

I own a Lenovo notebook (model Z570) on which I have already used a number of Windows and Linux installations pretty well, but now its EFI boot order seems to be broken. After the recent installation ...
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77 views

efi usb boot problems with linux mint 17.2

I've created a few usb boot sticks for linux mint 17.2 a few different ways (i.e, from both windows & linux) that all work correctly when trying to boot my laptop. However, when I try to boot ...
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1answer
34 views

Restore Windows From Data Backup?

So I managed to break my partition table, but I was able to recover my entire C: drive and copy every file and folder to an external drive. My question now becomes, is there anyway to, when I ...
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47 views

Move bootmgr from one drive to another (EFI)

My computer currently boots from my HDD, then loads the system located on my SSD. In the following picture, disk 0 is my HDD that contains the boot manager, and disk 1 is the SSD I want to boot from. ...
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47 views

No disks connected, why is Windows Boot Manager still a boot option?

Title covers 98% of my question. I'm trying to figure out what the Windows Boot Manager BIOS boot option is. In doing so, I've disconnected every memory device that could possibly hold an OS, ...
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2answers
109 views

How I create an USB entry on EFI boot?

I bought a second hand Samsung Ultrabook N530U3C which the boot is not working well. The previous owner managed to install linux and make it boot, but the USB entry on the EFI boot is not working. I ...
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146 views

Can't call grubx64.efi using startup.nsh in EFI

I installed Deepin 2014.3 on VirtualBox. When I launched it I got the regular skip startup.nsh message with the counter and the prompt right after it. My grubx64.efi resides under FS0:\EFI\Deepin ...
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1answer
227 views

Boot from USB/DVD in EFI Mode

I would like to perform a clean UEFI installation of Windows from a USB/DVD. That involves reformatting the disk to GPT and re-creating the EFI sector. My question is: how to boot from a peripheral ...
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90 views

What is the method of creating a Windows-booting EFI System partition?

I thought an EFI System Partition that boots Windows (specifically Win10, but I think the concept is the similar for all NT-based Windows) was a unique type of EFI system partition that can only be ...