For questions on “Secure Boot” and “Restricted Boot” the new bios feature that is in computers with the “Windows 8” logo.

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47
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1answer
10k views

If I buy a computer with Windows 8 and Secure Boot, will I still be able to install Linux?

I've heard a lot about how Microsoft is implementing UEFI Secure Boot in Windows 8. Apparently it prevents "unauthorized" bootloaders from running on the computer, to prevent malware. There's a ...
8
votes
2answers
5k views

Is there something like a BIOS in Windows 8? [closed]

Is there something like a BIOS in Windows 8? How can I set up the boot device priority? My problem occurs when switching on my computer. It immediately goes to Windows 8 loading screen without ...
8
votes
3answers
17k views

How would I reinstall the grub-efi bootloader on Fedora Linux?

I recently installed Fedora 18 using EFI boot. Like the other current linux distributions, it sets up GRUB2 for me. I have experience with re-installing the BIOS version of GRUB when things go ...
7
votes
2answers
12k views

What is “Secure Boot” in Windows?

This morning I was trying to upgrade Windows 7 to Windows 8 and ran into a problem: Your firmware doesn't support Secure Boot. What is Secure Boot, and what can I do in this situation if my ...
6
votes
3answers
4k views

Windows 8 to 8.1 Pro Upgrade SecureBoot Error

I upgraded from Windows 8 to Windows 8.1. I have an Alienware Aurora R4 with the latest BIOS firmware version, A09. Ever since I did the upgrade, I get a watermark on my desktop saying, "SecureBoot ...
5
votes
6answers
62k views

How to CLEAN INSTALL Windows 7 Professional 64Bit on Dell Inspiron 15R Turbo / Special Edition laptop?

I recently bought a Dell Inspiron 15R Turbo/Special Edition with following configuration: 3rd Generation Intel® Core™ i5-3210M processor, Windows 8 Single Language, English (64bit), 8GB 2 DIMM (4GB ...
4
votes
2answers
2k views

Adding X.509 certificate to UEFI secure boot database?

I have recently installed Fedora 20 on a custom desktop PC with a ASUS Z87-K motherboard. Given some commonly known bugs, I have installed the NVIDIA proprietary driver for my GeForce 630, and ...
3
votes
1answer
249 views

System does not boot DVD drive in secure boot/UEFI mode

I had to disable Secure Boot and enable Legacy Support to be able to boot a Windows 8.1 64bit DVD from the CD drive in the BIOS menu to install Windows. Is there any reason why this happens? Is there ...
3
votes
1answer
650 views

Windows 10 / Linux Dual Boot - Boot-loader Problems

I am currently running a dual boot of Windows 10 Home 64-bit and Xubuntu 15.04 64-bit on my machine. I have Windows 10 on an SSD, Xubuntu on another SSD and an HDD for storage formatted as NTFS (this ...
3
votes
4answers
3k views

How can I disable SecureBoot when my system won't boot?

I recently upgraded from Windows 8 to 8.1 and received a warning that SecureBoot was not properly configured. I proceeded to try correcting this by installing the default keys from the BIOS and ...
3
votes
1answer
2k views

Windows 8 Secureboot: How do you bootup from another device such as cd/dvd drive or usb flash etc.?

On PC's and laptops running an older OS, this is just a simple matter of going into the BIOS and setting the boot sequence and putting the boot cd/dvd in the drive. In many cases you can even just hit ...
2
votes
4answers
2k views

Windows 8 secure boot unavailable for my PC

When I ran the Windows 8 upgrade assistant, it said secure boot is not available for my PC firmware. I am using Dell XPS 17 L702 on 64-bit. Since I dual boot Linux as well, Is there a way to have the ...
2
votes
3answers
90k views

I can’t access the BIOS setup using F2 key on Samsung NP270E5V laptop

My Samsung NP270E5V laptop came with Ubuntu 13.04 installed on it, but I cant boot from a CD/DVD or USB flash drive to install Windows 7. Pressing F2 during boot doesn’t take me to BIOS menu so that I ...
2
votes
1answer
74 views

Stop Windows 8.1 from removing Grub

I've got a relatively new HP Envy machine running Windows 8.1 that I want to run Ubuntu on. Installation works great and I'm all happy until I boot back into Windows, at which point grub is removed ...
2
votes
0answers
128 views

If TPM owner password set in linux, how to enter owner password in windows to enable bitlocker?

I have successfully taken ownership of, and used various features of, my tpm in linux, using tpm_takeownership and related applications. Now when I try to enter the owner password in windows to ...
2
votes
1answer
930 views

Monitor only works if Legacy BIOS (CSM) disabled?

I have an Asus Q550-LF computer running Windows 8.1 Enterprise. It has a MiniDisplayPort output which is connected to a MiniDP to DVI adapter. I discovered that my monitor was not working the same day ...
2
votes
1answer
3k views

Questions about using Clonezilla to create and restore image on Windows 8.1 secure boot system

I'd like to use clonezilla to create a disk image of a Windows 8.1 system with secure boot enabled and some third-party software installed, so that I can at a later time restore the system from that ...
1
vote
2answers
8k views

How can I disable Secure Boot, without entering in BIOS Setup?

I had UEFI Secure Boot enabled laptop with Windows 8 installed in, the problem is that I restored another OS(linux) and now I cannot enter in BIOS Setup. Is there a way to disable UEFI Secure Boot ...
1
vote
1answer
426 views

Cannot boot after migrating my Windows 8.1 installation to a new drive

I want to migrate my Thinkpad X1 Carbon (2015)'s Windows 8.1 installation to a new 240GB PCIe 2.0 4x SSD. I figured that Clonezilla may work for that but cannot boot now. Turned off SecureBoot ...
1
vote
2answers
347 views

Secure Boot, Bumblebee and Fedora - how to?

I'm a happy user of Fedora 19 and I have it installed on a Samsung Series 5 laptop, which has an off board video card from NVidia - specifically a GeForce GT 630M. I managed to successfully install ...
1
vote
2answers
378 views

What happens if you delete all secure boot variables?

I am attempting to install Kali Linux alongside a preinstalled Windows 10. Secure boot restricts me from booting from USB, so what happens if I delete its variables?
1
vote
1answer
2k views

Can I enable Secure Boot on a computer where Windows 8 was not preinstalled?

Despite all the hate surrounding Secure Boot, I frankly think it's a good idea, if it can be turned off by the user (which it can be on non-ARM systems). My laptop didn't have Windows 8 installed, but ...
1
vote
1answer
175 views

What prevents me from writing a bootkit that uses a recognized UEFI key?

As far as I know, UEFI Secure Boot works this way (more or less): for certain operating systems to boot, they must be signed with a key that is checked by UEFI at every boot. If a bootkit replaces the ...
1
vote
0answers
25 views

Windows 8 can't override Ubuntu

I had Windows 8 installed on my Asus X5551M, then I installed Ubuntu 14.04 over it. Now I want to go back to Windows 8 to sell the computer. I created a Windows 8 USB using the exe from the Windows ...
1
vote
0answers
59 views

UEFI multi-factor authentication on admin password?

Many UEFI vendors offer boot and Admin passwords for a local machine. For a normal cold boot or reset, I would like the UEFI system to simply pick the properly signed bootloader and proceed. Having ...
1
vote
1answer
511 views

Does Windows 8.1 Secure Boot need a TPM chip?

I've seen conflicting information about the need for a TPM chip when enabling Secure Boot in the UEFI BIOS. Is a TPM (Trusted Platform Module) chip needed for Secure Boot? Thanks Edit: Thanks ...
1
vote
4answers
14k views

Is it possible to make a EFI file to boot Yumi USB flash drive?

2 days ago I've bought an HP Envy laptop, which comes with Windows 8 pre-installed. Before that I were using Yumi USB flash drive with a dozen of boot options to set-up the computers (e.g. ...
1
vote
1answer
938 views

Secure Boot is not compatible on my PC; will I be able to install Windows 8 on it?

Yesterday, I ran Windows 8 upgrade assistant on my PC, Only problem it gave is that Secure Boot isn't compatible with your PC Your PC's firmware doesn't support Secure Boot so you won't be able to ...
1
vote
3answers
2k views

Booting CDs/USB devices after installing Windows 8

I recently installed Windows 8 on one of my four primary partitions. I had two partitions for Windows 7 (boot and os), one for the Windows System Recovery Environment and the last for Ubuntu. I was ...
0
votes
2answers
6k views

Does CentOS 6.4 Support UEFI and SECURE BOOT Fully?

Does Minimal Edition of CentOS 6.4 support UEFI & SECURE BOOT fully? I want to install it besides Windows 8. Now does it install normally or does it not support UEFI & SECURE BOOT fully yet? ...
0
votes
4answers
7k views

Is it possible to downgrade an OEM Windows 8 install to Windows 7?

I recently purchased an ASUS K55A. Like all Windows 8 machines, it come with a UEFI feature called Secure Boot. This basically makes sure that the laptop won't load anything other than the Windows 8 ...
0
votes
1answer
50 views

secure boot - runs fine with .cer - fails with .crt certificate

I have Asus X200MA notebook with Windows 8.1 64bit. I have setup shellx64.efi to run under secure boot. File is signed with my own key (created using openssl) and it runs fine when .cer format ...
0
votes
1answer
120 views

Secure Boot for Linux?

Is the "esp boot partition" as secure as an ext2 partition. If the secure boot feature is not enabled. My current research reveals contradictory opinions among the leading OSes, with choice being ...
0
votes
2answers
610 views

UEFI vs. ARM TrustZone

I understand UEFI has a Secure Boot feature that is now for all Win 8 (tablets, and smartphones). How does this fit in with AMR's TrustZone for example? Is UEFI like a firmware TPM that can sit as a ...
0
votes
1answer
72 views

Is there a way to tell whether my EFI bootloader would accept the signature of the binary without reboot?

Assume that I have just installed a signed EFI bootloader (e.g. grub2 from Ubuntu 14.10 amd64 on a Lenovo IdeaPad U410 which can only boot in secure boot EFI or legacy mode) on a machine from within a ...
0
votes
1answer
5k views

ASRock UEFI Setup Utility No option to disable secure boot

I want to downgrade my computer from Windows 8.1 to Windows 7. I originally had Windows 7 on my desktop, then upgraded to Windows 8, then Microsoft basically forced me to upgrade to Windows 8.1. I was ...
0
votes
1answer
14k views

Cannot modify BIOS setting on Asus Zenbook UX31a

I bought an Asuz Zenbbok UX31A with windows 8 a while ago. After I bought it I decided to put windows 7 on it and everything worked fine. Yesterday I updated my bios in order to fix a fan issue and it ...
0
votes
1answer
2k views

How to re-sign the Windows boot loader to re-enable secure boot on an HP laptop?

I just purchased a "HP Pavilion 15-B055ca (C7C80UA#ABL) Ultrabook" from my local computer store the other day, as well as an SSD hard drive. I removed the original 500GB HDD, installed a 120GB SSD, ...
0
votes
1answer
85 views

Secure Boot State is OFF although it is turned on in UEFI Firmware Settings

Please help me the following problems: While checking system information using msinfo32, I see that Secure Boot State is OFF although I enabled it in UEFI Firmware Settings before. I also accessed ...
0
votes
1answer
17 views

Adding keys to Secure Boot database on an HP Pavilion 14-ab057ca

I am trying to add a custom key in Secure Boot database. Don't tell me "Activate Setup Mode", " Change the PK", "Add a KEK" or anything, I know how to do it. The problem is: I can't switch my machine ...
0
votes
0answers
52 views

Samsung Series 7 NP700Z5C - Laptop always restart after the Samsung logo

I'm in trouble with my laptop because I want install the Linux on my laptop in dual-boot with Windows 10. So for that, I created a new partition on my HDD and I did the following changes on the Bios: ...
0
votes
0answers
58 views

Can't install Win 8 Pro on laptop due to BIOS keys

I have a Dell laptop installed with Win 8 (home) edition. A while ago I bought a copy of Win 8 Pro to install on the same laptop. Yesterday I attempted to install the Pro edition, but it didn't ask ...
0
votes
0answers
156 views

My notebook samsung after install Windows 10 don't boot

I can't boot my W10 because the message Bootmgr is missing shows up. Bios only open with ESC on the black screen, before, I used F2. In the bios, I can't find secure boot in Boot options or ...
0
votes
0answers
42 views

Query about Graphics card and UEFI Support

I am trying to better understand graphics cards and UEFI support. Some related post seems to be here on this forum as well. It seems there are graphics cards that have UEFI Support. My understanding ...
0
votes
0answers
35 views

Need help understanding GUID - Secure Boot Keys

I am experimenting SecureBoot using Tiano Core OVMF. While inserting secure boot keys (.cer format) thru OVMF UEFI firmware interface, it also asks for GUID. I am leaving that blank in simulation, ...
0
votes
0answers
102 views

Virtualization with UEFI'secure boot feature

I'm interested in the notion of emulating digital signature checks in virtual machines—the host can be booted without hardware-based digital signature checks, which can be moved to the VM, and the ...
0
votes
0answers
167 views

KeyTool.efi - Can not add new db key in user mode - Secure Boot

On virtual machine with OVMF implementation of Tianocore UEFI, I ran signed Keytool.efi (Part of efitools-1.5.3-1.1.x86_64 ) initially in Setup Mode. I inserted db (signed by KEK Private) , KEK ...
0
votes
0answers
47 views

UEFI Secure Boot Keys

Out of curiosity to understand Secure Boot, I explored Tianocore’s OVMF along with QEMU virtual system on Linux. I could experiment & see how Secure boot prevents unsigned efi file from running ...
0
votes
2answers
119 views

Cannot boot win 8.1 without install cd

I've formatted my HP laptop and installed a new win 8.1 from dvd. But now I cannot boot from hard drive unless the install CD is presented. There's an error message displayed when booting in non ...
0
votes
1answer
106 views

How to deactivate secure boot on windows 8.1 when uefi firmware settings arent available?

I've installed Windows 8.1 in UEFI mode, screen that proves it is below After rebooting system in advanced mode going to: Troubleshoot->Advanced options I can't find UEFI Firmware settings tile ...