The Unified Extensible Firmware Interface BIOS (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI is a replacement for the older BIOS firmware interface present in all IBM PC-compatible personal computers

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Laptop not booting from any bootable device (UEFI broken?)

I was trying to install Debian in a dual boot with the already installed Windows 10 on my laptop. Now when I boot up the PC it shows the Dell logo and the options to press F2 for Setup and F12 for ...
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24 views

How can I move Windows 10 bootloader (GUID) only to SD card?

I have been trying to upgrade my laptop from a AHCI SSD to a much faster NVMe SSD without much success. I've pretty much concluded that my six month old Dell XPS 13 9343 doesn't have BIOS support for ...
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Shrink total disk image: UEFI GPT Flashdrive - freespace at end

I have a disk image from a bootable flashdrive. It is GPT for EFI booting, so there is a small Vfat32 partition and three other Linux partitions, followed by about 3G of free space. I need to disk ...
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Lenovo Thinkpad T450s: “Error: The non-volatile system UEFI variable storage is nearly full.”

A customer of mine is using a Lenovo Thinkpad T450s since something like a year. The machine is running Debian jessie, with a kernel out of jessie-backports, right now 4.5+73~bpo8+1. The latest UEFI ...
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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 ...
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32 views

Surface Pro 4 UEFI Password reset

I have a Surface Pro 4 in which I have never set a UEFI password , but today when I tried to enter UEFI it is promoting me to enter a password which I have never set. I bought it brand new so I am ...
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14 views

BIOS only boots entry manually

My PC came with an HDD preinstalled with Windows 7 in MBR mode. Now I upgraded it with an SSD and installed Windows 10 as GPT because the PC supports UEFI. If I restart the PC it boots Windows 7 which ...
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How do you underclock RAM (with Gigabyte F2 UEFI)?

I've purchased an AMD A10 7850K with a Gigabyte GA-F2A88XM-D3HP and 8GB 2400MHz Corsair RAM for my computer. The problem is that the AMD A10 7850K doesn't support RAM at 2400 MHz, so I'm trying to ...
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10 views

Forcing legacy boot

I have a new PC with a reference Intel motherboard and AMI BIOS (5.010 on a LynxPoint-LP chipset motherboard). There is no OEM support, so I'm on my own with this. I have a PXE network and WDS ...
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33 views

Unable to boot from clean windows 8.1 and 10 installation

I'm having an issue I spent the whole last day on troubleshooting and I've read a lot of threads both here and other QA/forums. I recently bought a new SSD disk from OCZ, a Trion 100, because my ...
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Is it possible to make a usb that is bootable on both uefi and bios? [duplicate]

I have a grub4dos multiboot usb drive that contains some tools for computer checking. However, it only works on legacy boot. If you want to boot up from the drive, you need to change the bios to ...
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19 views

Trouble with mouse pad after installing/booting up Ubuntu 16.04

So I just received on old laptop from a friend and currently trying to install Ubuntu 16.04 LTS on the laptop. Here are the specs of the laptop: Brand: ASUS Memory: 2.8 GiB Processor: Intel ...
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2answers
57 views

Windows 8 - System found unauthorized changes on the firmware

I have a PC running windows 8 from Asus. A couple of days ago, I downloaded a windows update and the next morning when I tried to boot up the computer, it sent me directly to the BIOS, after giving ...
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2answers
68 views

How do I boot to BIOS directly from Ubuntu?

Disclaimer: I have basically no experience with BIOS, UEFI, or anything of that kind. Earlier today I installed Ubuntu 16.04 on my Acer Aspire V5-571 alongside Windows 10. (This laptop came with 8 ...
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23 views

Can editing the UEFI improve stability or performance?

While looking into something else sort of unrelated, I stumbled in the bios modding community, but their explanations are mostly opaque, frequently giving no guides (what they do is that they let ...
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2answers
47 views

Installing Win7x64 on existing Win8 laptop for dual-boot - UEFI/GPT Issue

I have a UEFI HP G7 Laptop with Windows 8.1 pre-installed, and I'd like to add Windows 7 as a dual-boot. In Win8, I've turned off Fast Startup, made room on the existing partition in order to create ...
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1answer
57 views

GPT Partitioned Disk not Recognized by BIOS

I have received a Samsung Ativ Book 4 (model no. NP4705E-K01UB [this computer is UEFI compatible BTW]), and for the first few months that I used it, it has worked fine with MBR partitioned disks. ...
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26 views

Will Debian UEFI-installer discover existing UEFI Windows 10 to include it for dual-boot?

I have Windows 10 UEFI-installation on my machine (hard disk "A"), and I'm going to install Debian in UEFI mode to the disk "B". I doubt that Debian will detect another distribution and include it to ...
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24 views

Unable to UEFI boot once RAID is enabled

I have the current drive setup. 1 SSD that holds windows, 2 smaller SSD's that are RAID0'd and 1 platter drive. When I installed windows 10, all was good and things were booting fine. After a BIOS ...
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Reformat windows: use usb (bios?) or uefi boot device? [duplicate]

I'm trying to reformat my PC using a flash drive. When I go to the boot menu should I choose "usb: myflashdrive" or "uefi: myflashdrive"?
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21 views

I've installed windows 10 with bios set to legacy, windows hangs on shut down?

I've installed Windows 10 on my new Lenovo G50-70 with Bios set to legacy boot, At first i didn't know how to enter to the bios so i pressed alt+f12 to choose which device to boot from so i found 4 ...
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35 views

Bcdedit's /sysstore: What is the “system partition”? Is it the EFI System Partition or the Windows installation partition?

I never really got a good explanation how. From its example, it is used on the C: drive, which implies it is used on the Windows drive (with the Program Files folder, Windows folder, etc.) But ...
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2answers
174 views

Make existing Windows 10 installation bootable from USB

I bought a new laptop (Lenovo Thinkpad) which came with Windows 10 installed. I threw out the hard disk, replaced it with an SSD and installed Linux on it. Now I put the old hard disk into an USB ...
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27 views

Partitionning : is it ok to put my OS at the end of my disk?

I've build a small HTPC; and I have a 2TB HDD in it. The idea is to store only medias on that drive, and to have a separate M.2 SSD drive for the OS. BUT those SSD still are expensive, and i'll wait ...
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79 views

How to boot Snow Leopard bootable usb with Clover or any other hackintosh bootloader?

So I followed the tutorial in this question answer and created a "bootable" USB from my OS X snow leopard '.dmg' installation media. The problem is that my Clover EFI bootloader doesn't seem to ...
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21 views

Windows 7 UEFI: Help bcdedit find the “default” store in the EFI partition

bcdedit and similar tools[1] can't find where the store is. It's in the EFI system partition and I have to manually mount and assign a letter, then work on it with /store. Is there a "setting" that ...
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20 views

Converted Windows 7 to UEFI, now fails to do hybrid sleep

I have two hard drives, 3TB and 2TB. 2TB drive uses MBR, 3TB uses GPT. My Windows 7 OS is installed in the 2TB hard drive. I wanted to try out Elementary OS so I installed it on the 3TB drive in UEFI ...
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1answer
80 views

How to enter UEFI BIOS on Acer Aspire One, when windows 10 has disabled F2?

Web searches show that F2 is the key to enter BIOS on Acer Aspire One and it was working fine when my system had windows 8. When I upgraded to Windows 10 recently, I see that F2 is not working. I ...
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2answers
53 views

Booting with MBR in UEFI (No CSM mode at all)?

I'm asking here since I can't find a clear and definite answer to if it is possible to boot with an MBR partitioned hard drive in an UEFI-only environment. I've read this question but it is still ...
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27 views

Kali Linux USB Bootable UEFI Failure to find Flash Drive

Thanks for taking the time to view my question, I have been searching for hours (no joke) to have no avail. I got on my computer and decided to make Kali Linux bootable since Virtual Box had tooo much ...
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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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3answers
107 views

Upgrading to Windows 10 with EFI dual boot

I have Linux Mint and Windows 8 installed on my Lenovo laptop side by side (on different partitions of the same HDD) and booting in UEFI mode. I usually boot Windows from GRUB but I can also get it to ...
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Can EFI/UEFI theoretically steal LUKS password?

I usually keep my data private by encrypting the whole hard drive. My previous notebook had BIOS, without UEFI. I have bought macbook, want to install linux in dualboot there. So I wonder if EFI can ...
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26 views

UEFI boot and data disk

I'm on Windows 10 and I'm ready to convert to UEFI boot, but I want to know, if I need to have all my disks with GPT or only disk from which I will boot. Because my data disk is really full and ...
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1answer
111 views

Laptop boots extremely slow; black screen

I have a Toshiba Satellite L50-B-2G9, which takes hours to boot. Initially I had windows 8.1 and Ubuntu 15.10 installed side by side and switched between them regularly. I noticed it took longer and ...
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64 views

Do I have to have my OS installed with UEFI to convert my system HDD from MBR to GPT without data loss?

So as of right now I have a PC with a BIOS-only mainboard (Gigabyte 775 - GA-P35-DS3) with which I installed Windows 10 64bit on my 4TB hard drive with MBR. Now I'd like to buy a new mainboard with ...
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92 views

Getting error: Windows cannot be installed to this disk. The selected disk is of the GPT partition style

I am trying to reinstall Windows 10 on my friends machine from bootable USB. Following is what I have done till now: I created bootable USB using Windows 10 ISO and Rufus with GPT Partition scheme ...
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2answers
48 views

Unable to access boot menu

I've been having a difficult time trying to install Ubuntu on my laptop due to a silly mistake I made earlier. During the setup process, I installed the boot loader to /dev/sda8 instead of /dev/sda ...
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1answer
59 views

Booting from UEFI

I have a Gigabyte board with UEFI, and I can't get an OS up and running. Unfortunately, this product supports booting from neither USB nor CDROM. I've built a SSD with the most recent version of ...
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33 views

UEFI APM RTC Wake Up and standby / hibernation compatability

I configured my Windows 10 PC via UEFI APM to boot every day at 12:00:00 and shut down at 13:00 if not accessed via Teamviewer in the mean time. The PC showed up in teamviewer very irregularly ...
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61 views

Installing Windows from bootable USB pendrive on UEFI enabled machine

I have 5 year old Dell XPS 15. I have installed Windows several time one it using procedure below: build bootable USB pendrive from Windows ISO using a Windows DVD/USB tool plugging in USB pendrive ...
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3answers
118 views

Unable to install WIndows 7

I am at the point where I have no idea what I can try next after 4 hours of failing. I have tried following options enabled/disabled in ALL possible combinations: Secure Boot ON/OFF UEFI/LEGACY AHCI ...
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bitlocker on/off after uefi flash and recovery key has changed?

Amendment: I noticed that though, BL is turned off, that when I try to use recovery options in Windows 10, or when I turn off and back on the TPM in UEFI, that the BL "recovery key" from the original ...
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57 views

Why can't I boot in UEFI Mode?

I just upgraded my computer from a HDD to an SSD. When I boot my computer with the new SSD, it must be in the legacy boot mode, or it will fail to start. My old drive was UEFI, but now that option ...
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31 views

What is the key combination for upgrading backup firmware on gigabyte z170-hd3?

Recently switched to gigabyte z170-hd3. some Gigabyte cards have a dual firmware feature, so if the main uefi is flashed incorrectly, it will boot from the backup one. I upgraded the main firmware ...
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57 views

Windows 10 installation winload.efi error

I previously had installed Windows 10 Pro on my Acer laptop and dual boot it with Arch Linux. After finding out my Win 10 key requires Education edition, I downloaded Education edition and using ...
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69 views

how to Boot to UEFI shell

I am trying to follow some instructions to update some firmware and my instructions are x64 UEFI environment: Boot to UEFI shell Run update.nsh My OS : ...
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2answers
87 views

Repair Ubuntu boot loader from Windows

My windows 8 is installed on the C drive. I installed ubuntu on the D drive. By mistake I chose the boot loader to load from the C drive while installing ubuntu. Then, restarted and it directly booted ...
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38 views

How to Disable ASUS UEFI vBIOS Tool?

I just did a complete reinstall of my Windows 7 64-bit Pro operating system and all drivers and other software, after my primary hard drive crashed last week. Now, when my computer boots normally, ...
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Starting a custom UEFI application from Windows Boot Manager

Is it possible to make a boot menu entry in Windows Boot Manager BCD to start a custom (signed) UEFI application like, say, GRUB or Intel's UEFI Shell? What are the relevant bcdedit commands? It is ...