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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How to fix EFI-boot on my Macbook Pro after Ubuntu install?

The MacBook does not boot. The screen stays blank (black) – not the grey, active screen like normal. To power off, I hold the power button down. After 5 boot attempts the MacBook finally shows the ...
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2answers
3k views

Can i delete {fwbootmgr} and system will defualt to {bootmgr}?

{Fwbootmgr} skips {bootmgr} I used bcdboot C:\Windows /l en-gb /s B: /f ALL from bootable usb when ASUS K55A - HI5014L magically corrupted boot information when multiple f1-12 keys were pressed at a ...
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1answer
20 views

EFI and GRUB2 where to get binaries and how to mount the boot system

UEFI and GRUB2 Anybody knows the site to get the binaries (bootia32.efi and bootx64.efi) to boot grub2... also the GRUB2 binaries... and a good tutorial help on this... I want to make a multi-boot ...
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0answers
11 views

Dual Boot on fakeraid

I am having some issues with my MSI notebook: Currently there is Windows 10 installed in UEFI mode and the C: partition is Bitlocker encrypted. The Main disk is a RAID0 which is setup in the BIOS ...
6
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1answer
4k views

What is the correct way to install linux on a Macbook Pro

I've had a lot of trouble doing this. It always is unable to boot after installation (I get the famous question-mark in a folder thing). I've installed http://www.rodsbooks.com/refind/ however after ...
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0answers
26 views

Can't boot into windows 10

I can't boot into windows 10. The partitions on my ssd are: ESP Reserved Partition (I assume for windows 10) Windows 10 Windows 10 Recovery I can't select which Windows 10 OS to boot into. I ...
0
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1answer
56 views

Restoring Windows Bootloader

Upon trying to install another operating system that used the Clover Bootloader and failing, I now can not boot into my Windows installation, getting boot0ss: error. I never had access to the failed ...
0
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2answers
39 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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0answers
19 views

Windows 10 flashing screen after login

I copied the Windows 10 partition and then in the original used the command "bcdboot e:\windows" to add the second Windows 10 OS. It shows up fine and it even boots, but after I log in I get a black ...
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0answers
3 views

Recovery partition for identical OS

I have a recovery partition installed and would like the ability to choose which OS to use the recovery for. There are 2 copies of windows 10 installed and one copy is a duplicate of the other. I was ...
0
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0answers
8 views

Add windows to efi

I duplicated the windows 10 partition. I want to be able to choose which windows partition to boot into but the second windows copy wont boot. Is there anyway to add the second windows 10 to efi so i ...
0
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1answer
41 views

What is an EFI system partition?

What is an EFI system partition? I have a new laptop with Windows 10. The partitions on the SSD are EFI system partition Windows 10 partition Recovery partition
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1answer
23 views

Windows recovery partition

If i were to duplicate an OS partition such as windows 10, and both versions are bootable, would either version be able to access the recovery partition? For simplicities sake, original Windows OS ...
17
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4answers
86k views

How do I mount the EFI partition on Windows 8.1 so that it is readable and writeable?

Here is what I do: restart machine with Windows 8.1 determine "EFI System" partition with the Disk Management utility run command prompt as administrator type diskpart type select disk 0 then select ...
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2answers
3k views

How to get rEFInd working with FileVault 2 on OSX 10.8

I installed rEFInd on my new Macbook Air which I planned on using to do a dual boot to Linux, but prior to installing Linux, I decided to encrypt my drive. I knew I was going to do this, so I had ...
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0answers
27 views

MacBook EFI, no sound. Convert to hybrid GBT/MBR?

I only use Windows on my MacBook. So I made a clean installation of Windows without dual-booting OSX. This installation resulted in the Mac is now booting in EFI mode, which led to the sound and ...
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1answer
4k views

Fedora 19 (you have not created a bootloader stage 1 target device)

I want to install fedora 19 to my HDD but I get errors: you have not created a bootloader stage 1 target device sda6 must have one of the following disklabel types: GPT. I tried: Create 1-2 mb ...
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2answers
38 views

Dual boot with BIOS and EFI?

I installed Ubuntu on a different PC than the one it's running on right now. The old one only had BIOS support, so it's installed that way. I recently installed Windows 7, using UEFI, because it ...
0
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1answer
20 views

Error when moving partition

I'm trying to move the partition hfs to the right of the unnalocated space in this image: I'm getting the following error: GParted 0.19.0 --enable-libparted-dmraid --enable-online-resize ...
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1answer
18 views

Show options of EFI entries

As described in the Arch Wiki, one can create an UEFI boot entry using efibootmgr like this: efibootmgr -d /dev/sdX -p Y -c -L "Arch Linux" -l /vmlinuz-linux -u "root=/dev/sda2 rw initrd=/initramfs-...
0
votes
1answer
19 views

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 ...
0
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1answer
19 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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0answers
33 views

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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0answers
33 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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1answer
105 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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2answers
5k views

How do I disable digital signature checking for Windows 8.1 EFI files?

I'm trying to patch my bootmgfw.efi file to change the background color of the BitLocker password prompt and other Windows bootup screens. I found the values to search for and replace for the color (...
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3answers
3k views

Does there exist a native UEFI disk/partition manager?

UEFI has the infrastructure to support complex applications at boot-time. One of the most urgent needs of the hour is a UEFI application for GPT disk management. A lot of partition management cannot ...
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0answers
24 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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2answers
180 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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2answers
89 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 ...
0
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0answers
23 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 ...
0
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2answers
98 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 ...
2
votes
1answer
35 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.
0
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1answer
18 views

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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3answers
45 views

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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2answers
381 views

replace efi firmware with old legacy bios?

So I bought a new laptop with 64-bit windows 8 pre-installed, and in preparation for downgrading to win7 32-bit, i've been reading about EFI and MBR etc.. It seems like the firmware which boots disks ...
0
votes
1answer
72 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 ...
0
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2answers
431 views

How to register/convert a restored linux OS (bios) to EFI booting

First let me explain my current set up. I recently scrubbed my two main drives and converted them to GUID. On the primary drive (sdb in my case) I have created an EFI boot partition (ESP) on /dev/...
0
votes
1answer
123 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 ...
0
votes
1answer
25 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 ...
0
votes
1answer
66 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 ...
0
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1answer
783 views

How do I convert an EFI System Partition into a normal GPT partition?

I had a Windows 8.1 that required a re-install. In the process, my 4TB secondary disk is now showing up in Disk Management as an EFI System Partition, with no volume. In DISKPART, a volume is shown, ...
0
votes
1answer
26 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 ...
0
votes
1answer
87 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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0answers
57 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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votes
1answer
6k views

Cannot EFI boot from Clonezilla disk image

I have created a Ubuntu Server 14.04 system that I would like to clone to several other machines with exactly the same hardware specifications. The system is an Intel NUC2820 with 30 GB SSD. The ...
0
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1answer
157 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: ...
0
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1answer
609 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 ...
1
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1answer
192 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 ...
0
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0answers
60 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 ...