Category: How to boot from efi file

Globally-defined variables that apply to all bootable devices and bootable programs on the computer. Boot option variables that apply only to a particular load configuration of a bootable device or program, such as an operating system. The system-specific variables comprise a boot entry for each configuration of a bootable device or bootable program on the computer.

Determines how long the boot menu is displayed. When this value expires, the boot loader loads the default operating system. Contains system-specific data. It is comprised of one or more boot entries for each operating system or bootable program installed on the computer.

A boot entry is a set of options that defines a load configuration for an operating system or bootable program. Specifies the boot parameters for the entry. Boot parameters are commands to enable, disable, and configure features of the operating system. The EFI Boot Manager passes these parameters to the bootable device or system to be interpreted and implemented.

For a list of the boot parameters that are related to driver debugging and testing, see Boot Options in a Boot. Specifies the location of the EFI boot loader for the operating system. On EFI-based systems, each operating system or bootable device has its own copy of the boot loader on the EFI partition. This identifier is assigned when the boot entry is created, and it does not change. It represents the boot entry in several lists, including the BootOrder array, and it is the name of the directory on disk in which the system stores data related to the boot entry, including backup copies of the boot entry.

An EFI boot entry ID has the format, Boot xxxxwhere xxxx is a hexadecimal number that reflects the order in which the boot entries are created. The Bootcfg and Nvrboot IDs are line numbers that represent the order of the boot entry in the Boot Entries section and change when the entries are reordered.

For a detailed description of boot options on Itanium-based systems, see the Extensible Firmware Interface Specification.

Overview of Boot Options in EFI

You can download a copy of the specification from the Intel Extensible Firmware Interface website. You may also leave feedback directly on GitHub. Skip to main content. Exit focus mode. The following sample shows a Bootcfg display of a computer with an Itanium processor.

Section heading Timeout Determines how long the boot menu is displayed. Timeout: 30 Default Specifies the location of the default operating system. This value changes when you reorder the boot entries. Bootcfg uses the NT device name of the partition in its path display. Is this page helpful?

Yes No. Any additional feedback? Skip Submit. Send feedback about This product This page. This page.You can also view and change some boot options in Control Panel under System.

Because this functionality is limited, it is not discussed in this section. Bootcfg bootcfg. You can use Bootcfg to add, delete, and change the values of all valid boot options; however, you cannot set an indefinite time-out value.

You can also use Bootcfg commands in a script or batch file to set boot options or to reset them after you replace or upgrade an operating system. You must be a member of the Administrators group on the computer to use Bootcfg. For detailed instructions about using Bootcfg, see Help and Support Center.

Opening EFI files

Nvrboot nvrboot. Nvrboot runs in the EFI environment. You cannot run Nvrboot while an operating system is running. Nvrboot edits only boot entries. You cannot use it to display or change the time-out value for the boot menu, although, you can use the push command nvrboot p to change the default boot entry. Nvrboot also includes commands to export backup copies of boot entries and to import backup copies of boot entries into NVRAM.

Nvrboot displays boot options in a user-friendly format.

how to boot from efi file

For example, it displays the operating system file path and the boot loader file path as a partition GUID followed by a Windows directory path. The following procedure explains how to start Nvrboot from the EFI shell, a tool provided with many Itanium-based systems. Because the EFI shell tools vary among manufacturers, the description in this section might not accurately describe the EFI shell interface on a particular computer.

At the shell prompt, type the drive letter or file system number of the system partition, such as C: or FS n, where n is the file system number of the system partition.

Type cd msutil to navigate to the Msutil directory where nvrboot. You may also leave feedback directly on GitHub. Skip to main content. Exit focus mode. Bootcfg Bootcfg bootcfg.

Nvrboot Nvrboot nvrboot. To run Nvrboot Reboot the computer. From the boot menu, choose EFI Shell. To start Nvrboot, type nvrboot. To find instructions for Nvrboot, type h. Related Articles Is this page helpful? Yes No. Any additional feedback? Skip Submit. Send feedback about This product This page. This page. Submit feedback. There are no open issues. View on GitHub. Is this page helpful?Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles.

Microsoft mandates that PC vendors allow users to disable Secure Boot, so you can disable Secure Boot or add your own custom key to get around this limitation. PCs that come with Windows 8 and Windows 8.

how to boot from efi file

You can choose to disable it or even add your own signing key. Organizations could use their own keys to ensure only approved Linux operating systems could boot, for example. You should check to see which process your Linux distribution of choice recommends. You should be able to install current versions of Ubuntu — either the LTS release or the latest release — without any trouble on most new PCs.

See the last section for instructions on booting from a removable device. Your computer will restart into the advanced boot options screen. You can boot from removable media by accessing the boot options menu in the same way — hold Shift while you click the Restart option. Insert your boot device of choice, select Use a device, and select the device you want to boot from.

After booting from the removable device, you can install Linux as you normally would or just use the live environment from the removable device without installing it. Bear in mind that Secure Boot is a useful security feature. The Best Tech Newsletter Anywhere.

Joinsubscribers and get a daily digest of news, comics, trivia, reviews, and more. Windows Mac iPhone Android. Smarthome Office Security Linux. The Best Tech Newsletter Anywhere Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles. Skip to content. How-To Geek is where you turn when you want experts to explain technology. Since we launched inour articles have been read more than 1 billion times. Want to know more?F9 at startup worked first time. ISO file to perform the task.

At the very beginning when you see the black screenkeep press F9 key, You will get the boot order menu. Didn't find what you were looking for? Ask the community or Ask the Virtual Agent.

how to boot from efi file

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Did you mean:. It has been a while since anyone has replied. Simply ask a new question if you would like to start the discussion again. All forum topics Previous Topic Next Topic. New member. Message 1 of 7. HP Recommended. I want to boot to a USB flash drive but do not know how to configure the new uefi bios. Specs; HP b09WM laptop. Level Message 2 of 7. Message 3 of 7. You may be able to select the legacy boot options menu from there.

Then you should be able to boot from the USB flash drive. Message 4 of 7. Message 5 of 7. Your F9 at startup was the trick. Thank you! Message 6 of 7.EFI partition is essential for the installed OS on the hard disk and usually created after operating system installation. What it is used for? How can you delete or remove it successfully when necessary? This article comes with all information you need. Both Windows and Mac operating systems are supported.

In order to protect the EFI partition, Windows will attempt to prevent you from deleting it. So, in the circumstances where you still wish to delete the EFI partition, what can you do?

legacy support ! enable , UEFI Order , how to boot hp laptop using Windows 10 bootable CD / DVD

As we mentioned above, the EFI partition is essential if you want to be able to bootup your operating system that you have installed on your internal hard drive. However, if you have an external hard drive rather than internal one, you do not require an EFI partition to boot from the drive. Users who have created an EFI partition on a Mac and now want to install Windows will need to delete the original EFI partition and generate a new one. Follow the wizard to create a bootable disk.

In the main window, right click on the EFI partition that needs to get rid of and select Delete Partition. The EFI partition has now become unallocated space, and you can add this unallocated space to any of the existing partitions by using the Merge Partitions function. If you delete the EFI partition on the system disk by mistake, then Windows will fail to boot. On occasion, when you migrate your OS or install it on a hard drive, it may fail to generate an EFI partition which causes the system to be unbootable.

So, what can do we if when this happens?

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In this case, you will need to create a new EFI partition and then install an EFI boot loader in order to make the hard drive bootable. Boot your computer from a Windows installation disc or recovery disk. After those two partition have been successfully created, use the commands below to install boot loader and other applications needed.

If your computer fails to boot because of a missing EFI system partition, you can use the above method to recreate it, and then your Windows system should boot as normal. Even though this will not cause data loss, it is also recommended to create a disk backup before you make any changes. What is an EFI partition? How to delete it? How to create EFI partition? Run the commands below to shrink the partition to free up some unallocated space.

Reboot your computer to see if it is now bootable. Still Need Help? Have your problem been solved? If not, please input query in the search box below. All rights reserved.Fake Flash Test. Windows restore partition. Get Windows ISOs. Remove Viruses. Contact Me. Read and Sign my Guest Book. Latest Site News 1. Useful External Links inc. Downloads 1. Tutorials, How To's and Guides Useful Articles 8. Grub4dos Command Primer. Grub4dos Example Menus. Fonts and graphics.

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Getting started with the Raspberry Pi RPi. Run registry entries. More Info.It cam with Linux installed on the M. I want to test Ubuntu I'm unable to find the setting s to make this USB stick to boot and work.

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I've even tried to upgrade the BIOS to the latest 1. Go to Solution.

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After some fiddling with USB sticks and settings, I finally found the answer. I did "pure" USB stcks, I. I is not working. View solution in original post. Connect the stick to usb port and reboot the system or turn it on as soon as you see the Dell logo tap F12 in the menu that appaers choose your stick.

The answer above is correct.

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On UEFI systems, the boot order list for local storage devices only includes paths that have been formally registered into the firmware, which is typically done during OS installation. Temporarily attached devices like flash drives are accessed through the F12 one-time boot menu. Glad you found a workaround. Use diskpart to clean, partition, and format the stick using fat32 as the filesystem. Span the. I believe that GPT used to work but recent firmware updates changed this - I'm not certain.

Spanning WIMs can be a problem because the Windows Setup interface won't allow you to select images that reside in a spanned WIM, so if you use a spanned WIM you'd need to apply the image to the disk manually using a tool like DISM -- but most people don't know how to do that.

It works brilliantly. The only catch is that you have to disable Secure Boot because the bootloader for the NTFS driver is provided under an open source license and Microsoft therefore won't sign the bootloader so that it's trusted under Secure Boot.

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But you can re-enable Secure Boot after you've installed whatever OS you're installing. These enumerate with "PMAP" when you do an f12 at boot. I think the update made a change so that it requires you to use fat32 so that it can read the efi - if the partition where the efi is located is on gpt it's not reading like it used to. Like I said - used to work and now suddenly doesn't after firmware updates but still works on other systems This was on a stick that was created by acronis imaging - I made a backup of the stick, then used diskpart to clean, partition, and format with fat After marking the partition as active and copying the files back down Files over 4gb need to be spanned or enumerated on a separate partition it worked as it used to.

When partitioning you can probably mark the system partition as fat32 and then just save your images or whatever to another partition. I would probably just boot a live stick and install ubuntu over the internet.

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