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Questions tagged [uefi]

The Unified Extensible Firmware Interface BIOS (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI replaces the Basic Input/Output System (BIOS) firmware interface originally present in all IBM PC-compatible personal computers

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Add new boot entry in BIOS using efibootmgr

I am trying to add boot entry for MBR table (shadow) in SSD. Using bcfg it is possible to browse to device fs0:\EFI\boot\bootx64.efi (pressing tab will show all the device in current directory). But ...
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windows trying to mount the entire disk containing ESP partition

I have a dual boot setup with Ubuntu 18.04 and Windows 10, on separate disks. Disk A has the ESP partition and the Ubuntu partition. Disk B has the windows partitions. When I tried to pass the disks ...
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35 views

Device support UEFI

I now have MBR and I want GPT. My firmware is now Legacy(BIOS) and I want UEFI. My firmware can boot in UEFI (option is there inside). I have Windows 10 PRO. Motherboad: 1949 KBC Version 90.0F ...
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24 views

Moving Windows partition (EFI, GPT)

Suppose I have a computer that was once a purely Windows desktop, whose disk contained at least the usual EFI System Partition (the ESP) and the Windows partition itself. Suppose that one day I ...
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32 views

Run script after apt-get updates grub

I use Debian 9 on an EFI system with a custom grub image and configuration file in order to make Secure Boot work. However, whenever apt-get updates Grub my customizations get overriden. What is the ...
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bcdedit issue? M.2 SATA to NVME clone: Windows 10 won't boot

Problem: Windows partition won't boot after cloning M.2 SATA drive to M.2 NVME. Background: Cloning process was simple raw dd copy. Drive had EFI, Windows 10, and Linux partitions. Cloning preserved ...
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38 views

Why does system report less memory in UEFI mode than in legacy BIOS?

I noticed that on a machine, if the firmware is configured in UEFI mode instead of Legacy BIOS, the operating system reports slightly less total memory (this is on Linux, but that shouldn't make a ...
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Cloning back Ubuntu partition after Windows 10 fresh install

I've had a 240 GB SSD for a while and just got a blank 1 TB HDD. I'm dual booting Ubuntu and Windows 7 Pro (on the SSD). I want to upgrade to W10 while keeping Ubuntu, so I moved all my documents/...
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22 views

BCDedit /store BCD /set {default} System cannot find file specified

A friend of mine recently had one of his bootloader files corrupted on his Windows 10 machine. We've tried several times to rebuild the BCD on the EFI partition using bootrec and bcdboot, but neither ...
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40 views

How to echo a blank line in UEFI shell?

I'm looking for a way to echo a blank line in UEFI shell scripts (*.nsh), similar to the DOS/Windows command line command echo.. While the echo command is supported by UEFI shell, it does not seem to ...
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30 views

Using built-in eMMC SD card slot on UEFI

I have a Lenovo ThinkPad X1 Yoga 1st (20FR). It has an eMMC SD card slot which doesn't seem to be available from the firmware, even though some relevant drivers are loaded: (uefi shell) > drivers ...
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1answer
40 views

How can I make an EFI-bootable partition on an external drive, keeping the existing partitions?

I have a 64GB flash drive with Linux on it (as if it were a hard drive), which I would like to shrink and add another partition to. But to do that, I need another Linux install to shrink the ...
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65 views

UEFI secure boot prevents Windows 10 from starting after a resizing operation

I'm currently running "Windows 10" with "secure boot" ON and the OS is installed on a SSD drive. I resized the partitions of another drive and the operations went well according to the application I ...
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68 views

Why does an OS and its installer behave differently depending on whether legacy mode is used or not?

Some context: Earlier today, I attempted to re-install Kali Linux on my machine (dual booted with Windows). To accomplish this, I downloaded the ISO and put it on my Easy2Boot USB stick. In order to ...
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38 views

Re-programming AMI UEFI Bios utility ver. 306

Assume the following "layer hieraky" in relation to bios settings: 1) Top = OS (eg. Windows 7,..10) including boot sector directories/files 2a) Middle = UEFI utility program/menus 2b) Lower = ...
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How to prevent Windows from 10 making its bootloader the default and skipping rEFInd

I have an Alienware X51 R3 to dual boot Linux and Windows 10. I use refind as my boot manager, but Windows keeps skipping it and booting directly to Windows 10. I've been having this problem for years,...
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How to stop Gigabyte Designaire X399 / Threadripper 1920x from crashing on resume from sleep with TPM enabled?

When I try to put my Windows 10 (version 1809) PC to sleep, it will not resume correctly, and seems to wipe the TPM settings, meaning I have to recover using my Bitlocker recovery key. Is there ...
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Why is Secure Boot needed if there is already UEFI lock?

As far as I know, enabled Secure Boot feature in UEFI stores signed keys in NVRAM for OSs' kernel images to check it's corruptness on boot level. But nothing prevents me to boot the Setup Menu and ...
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How to convert an MBR SSD to GPT in a UEFI environment

I recently was given an SSD by my friend. he used to use it on his laptop and has passed it on to me. The problem is that it is formatted to work with MBR. I have tried converting it but I would need ...
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31 views

UEFI SSD hidden from Linux?

I have a HP Prodesk 600 G3, and I were able to install Fedora 28 on the nvme SSD. When I put the computer in BIOS mode, then I wasn't able to see the UEFI Fedora SSD anymore from the BIOS or from a ...
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30 views

How can I check if my UEFI supports RAID?

I can't find it in UEFI settings. Motherboard name is ASRock Z370 Pro4. I had a look at the specification at the manufacturer's site however all the info they provide is: 128Mb AMI UEFI Legal BIOS ...
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56 views

Restoring windows 7 system backup to UEFI or GPT [closed]

I am forced to shift from my old HP dv6 3121nr Laptop to a new laptop (I am still to purchase) which comes with windows10 and GPT UEFI. I want to take system backup (may be with software like AOMEI, ...
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37 views

Fixing my multi-OS U/EFI Situation

You'll have to forgive my ignorance - even after some reading the suject elludes me a bit. I have the following installed and was booting them all successfully using rEFInd: Windows 10 Antergos (...
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46 views

Customized CentOS7.4 mininal iso not working for uefi

I am trying to create custom iso with CentOS7.4 mininal. For testing the command which i used to create iso. I did the following Unpacked Centos minimal iso. Copied contents to other directory I ...
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1answer
61 views

Dual boot hibernation with Win10 and Arch sharing EFI partition

My appologies in advance if similar questions has been asked. I actually wanted to ask this in comments on one post but don't have enough reputation. I have a 256GB SSD containing Windows10 and Arch ...
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102 views

Bootable USB not showing up in boot menu in UEFI

Suddenly my Dell, Windows 10 system wouldn't boot and the Dell service representative asked me to reinstall the OS. On using a bootable USB created using Windows 10 media creation tool it just wouldn'...
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1answer
109 views

Windows 10 Task Manager: CPU Speed Rises Above Maximum Speed when overclocking

I've seen the previous thread, but it's quite different as I've overclocked my cpu to 4.7GHz in UEFI keeping turbo boost enabled. Here's what the Task Manager is telling me: The CPU shows up as 5....
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How can I add UEFI and GPT support to Hirens BootCD for a bootable USB created Rufus?

I am trying to make a customized Hirens BootCD that will be bootable for a UEFI with GPT support. I plan on using Rufus. When I currently attempt this Rufus prompts me for a ISO image that has UEFI/...
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48 views

Check Bios uefi firmware files with md5sum

Can I get md5 hash for UEFI, BIOS firmware files with md5sum due to the new LoJax malware ( https://thehackernews.com/2018/09/uefi-rootkit-malware.html ). If yes, how to?
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Uefi bios check with md5sum

Can I make md5sum for UEFI, BIOS firmware files because of the new LoJax malware ( https://thehackernews.com/2018/09/uefi-rootkit-malware.html ). If yes, how to?
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3answers
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Is the “boot menu” a new way to manage “boot order” in UEFI?

I have HP computer where I enter UEFI/BIOS setup by pressing ESC key. The options that appear contain "Boot menu" and also "BIOS setup". I can ofcourse go into BIOS seteup and change the boot order ...
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How to make bootable Ubuntu USB stick to boot in legacy mode? (Dual boot system with Windows 7)

I have Fujitsu Siemens Lifebook UH572 -laptop with 64-bit Windows 7 Ultimate installed. Windows is apparently installed in legacy mode, and I would also like to install Linux Ubuntu 18.04 also in ...
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1answer
67 views

Missing UEFI Boot option entry

Configuration HP Omen 15 1 original HDD 1Tb with windows 10 1 M2 SSD 500Gb with Windows 10 Pro (I initially cloned HDD to SSD) See diskpart disk/vol - my main system is in Volume 4 (drive E:) on ...
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85 views

What is the difference between Secure Boot and Verified Boot?

As I understand it, both "Secure Boot" and "Verified Boot" work in the same way. In particular: on boot, the first thing that runs is code found in ROM. This ensures that it can be "trusted" the ROM ...
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ubuntu 18.04 upgrade failed for UEFI

After I upgraded my Ubuntu 16.04 to the latest 18.04, now my laptop doesn't start up at all and gets stuck at the grub command line. I have tried boot-info and boot-repair, in UEFI and BIOS mode (from ...
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Directly boot Android boot partition from GRUB?

I'm experimenting with an Intel-based Android laptop (Chuwi Hi10 Pro) and have installed Ubuntu 18.04 in parallel to the original Android 5.1 installation. The device is actually designed for dual-...
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1answer
41 views

Windows 10 Twice on same machine (again)

Windows 10 v1709 wouldn't update to v1803, so downloaded OS image, disconnected SSD with v1709 installed, and did custom clean install of v1803 to new SSD formatted as GPT. Verified new v1803 working, ...
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VM stuck in boot loop: Boot critical file C:\EFI\Microsoft\boot\resources\custom\bootres.dll is corrupt

A VM I built for a coworker has crashed and will not boot. It boots to a blue-screen. When I tried to run startup repair I found this in the error log: Root cause found: Boot critical file C:\EFI\...
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1answer
47 views

screen disconnects during linux boot until physically reconnected

I have got an Asrock J4105 mainboard During the boot, at some point in systemd, the screen goes black (saying no signal) until I take the HDMI cable and remove it and plug it back in. This is what I ...
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1answer
29 views

Cloning computer with UEFI boot

I have a mini PC where I have installed Arch Linux with UEFI boot. I'm trying to clone this install on other identical mini PC. I tried using Clonezilla alternative but at the end of the restoration ...
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9 views

Audio only works if startup chime is enabled in BIOS

I've got an ASUS U31SD. After replacing my HHD with an SSD and installing Linux Mint beside Windows my audio device only works after booting up into Windows or Mint if I enable the startup chime in ...
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1answer
74 views

Changing Boot Mode from UEFI to Legacy

I wanted to dual boot boot My Windows 10 with Zorin OS . I have done this before with Windows 7 . But when I tried installing EasyBCD in Windows 10 , It told me that most functions of Easy BCD wont ...
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Remove duplicated options in boot options, BIOS

I have dual booted my laptop. I have multiple choice in boot options in BIOS that are duplicates. The Ubuntu option is sometimes gone when I shut down from Ubuntu. Why does Boot option keep on ...
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What data can I safely remove, AKA, put a big partition in a smaller space

I have a system containing the following disks: 1x Western Digital Caviar Black 1TB with Windows 10 1x Western Digital Caviar Black 1TB with Gentoo Linux 1x Western Digital Caviar Black 1TB with ...
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51 views

UEFI configuration for DDR4 memory on ASRock X99 Extreme3

I once over-estimated my knowledge of hardware (especially combination of motherboard and memory) and bought 4x 16GB GeIL EVO Potenza DDR4-3000 DIMM CL16 for an ASRock X99 Extreme3. I tried to ...
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I'm not able to boot into windows as well as Live USB is also not working

Recently I was trying to dual boot my windows with Linux mint. After installing Mint from Live USB I removed my USB before it was prompted to. As the result I found 5 entries in the grub menu : 1. ...
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1answer
419 views

How to enter BIOS on Windows 10 Laptop that fails to boot with previously Fast Boot setting enabled?

There are a few related questions on this forum e.g. here & here, however I am still considering a slightly different situation. On a Windows 10 Laptop with Fast Boot enabled, the laptop does not ...
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Deleted Ubuntu partition. Now Windows nor Linux can start due to GRUB's normal.mod not found

I had Windows 10 and ElementaryOS Freya (Ubuntu 14.04) installed and both booting happily through GRUB. This is how my disks were set up: /dev/sda /dev/sda1 ntfs 420MB /dev/sda2 ntfs 210GB - ...
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1answer
48 views

UEFI / Legacy issue in Boot

I downloaded Linux Mint v19 and successfully installed through legacy boot (why I did it it through legacy, I'll explain later). However, turning on the computer only boots straight into Windows, ...
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Can I replace boot files with those of older version for installed/installation of windows 10?

I was running a windows 10 insider slow ring build, when a new one became available but when it restarted to update it would always freeze at the rotating dots, I switched to the fast ring but the ...