Questions tagged [efi]

Extensible Firmware Interface is a specification that defines a software interface between an operating system and platform firmware

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MacBook Pro: How to disable discrete GPU permanently from EFI?

I'd like to disable the NVidia GTX 750M GPU on my MacBook Pro 15" (Retina, Mid 2014, Mac OS X 10.10 Yosemite). I know I can use GfxCardStatus but I read I could have a more permanent solution by ...
Meligy's user avatar
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24 votes
5 answers
168k views

How to fix broken EFI partition?

I have an iMac running OSX Lion. I also installed bootcamp and Windows 7. During the install of Windows 7 I wasn't paying complete attention and deleted and formatted the EFI partition. I didn't ...
Rich's user avatar
  • 385
23 votes
2 answers
32k views

How can I triple boot MacOS Catalina , Ubuntu 18.04, and Windows 10

I currently use the mid-2014 MacBook Pro. I have read the similar questions asked but as I don't have much technical knowledge I thought I should create a new question. Device History I had ...
theSwapnilSaste's user avatar
22 votes
4 answers
17k views

Is a hardware-based full disk encryption possible on a Mac?

Is it possible to use hardware-based full disk encryption (perhaps on a Samsung 840 Pro SSD) on a Mac, specifically a Macbook Pro 8,2? If so, how? My understanding is that this will be handled in the ...
Eric Marsh's user avatar
16 votes
5 answers
71k views

How do I get rEFInd working with OS X 10.11 El Capitan?

I noticed that I could not install and use rEFInd after upgrading to OS X 10.11 El Capitan. This restricts me to OS X so I cannot boot my Linux partition. I get the following error: error "Could not ...
HarlemSquirrel's user avatar
14 votes
1 answer
39k views

How to examine disks and their partitions via terminal?

I am trying to examine my settings to prepare for a triple boot and would like to know how to completely examine my HDD before to make sure I know everything usefull for the project to know about it.
bomben's user avatar
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13 votes
2 answers
36k views

How to fix broken GPT, GUID and unmountable, no type volumes?

I have a Macbook Pro with retina, Yosemite and 500GB hard drive. I tried to install Windows using Bootcamp and accidentally deleted a partition, now my Mac cannot boot anymore. This is the output from ...
L N's user avatar
  • 527
13 votes
3 answers
58k views

Keyboard and touchpad are not working when booting from live USB

I have a MacBook Pro (mid 2017, 13", no Touch Bar) and I want to create Linux live USB. However, keyboard and trackpad are not working when I'm booting Linux OS from live USB. I'm able to select EFI ...
Peter's user avatar
  • 295
13 votes
2 answers
5k views

Hide "disk password" login option at EFI (Filevault) login screen

I encrypted my volume before installation and have added my user as FileVault user afterwards. Now I can login with either the disk password or my user login password at the EFI (Filevault) login ...
Jonas's user avatar
  • 131
12 votes
2 answers
4k views

Is there any way to manually bless firmware when main disk is external?

My iMac (mid 2010) keeps pestering me to upgrade my EFI firmware to 1.8. Sadly, no matter how many times I try to to upgrade the EFI (from the manual install, or the auto update), it does not seem to ...
Theo's user avatar
  • 121
11 votes
5 answers
107k views

How to update latest MacBook pro EFI firmware manually?

In short, the firmware cannot be updated either by upgrading macOS to High Sierra or by bless manually. Here comes the detail. My MacBook pro info: Attempt 1 - update it by updating macOS from 10.12....
Kent's user avatar
  • 413
10 votes
1 answer
20k views

How to downgrade EFI firmware back to version 1.6

I'm trying to get a SATA III hard drive to work in my MacbookPro5,1. I think I've finally figured out that if I downgrade the EFI firmware to version 1.6, my computer will negotiate the link at SATA 1 ...
meustrus's user avatar
  • 291
10 votes
4 answers
5k views

How can the average user easily validate the integrity of their Mac's firmware?

How can the average user easily validate the integrity of their Mac's firmware? Before you downvote this question or lecture me on how I am paranoid and no one should ever need to do that, please ...
CommaToast's user avatar
9 votes
2 answers
12k views

Why does Disk Utility create EFI partitions on external disks?

A technical told me about the EFI partition that... ...it's only there in case your computer will do an EFI update so the update files can be loaded onto the EFI partition. This is consistant with ...
gentmatt's user avatar
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9 votes
0 answers
8k views

Let's try to fix the "Sleep Wake failure in EFI -- Failure code:: 0xffffffff 0x0000001f"

I have had this well-known issue for a way too long time... Now it got unbearable and I'm hoping to find help here. The issue For those unfamiliar with it, here's the general description: Starting ...
mrclng's user avatar
  • 191
8 votes
1 answer
3k views

How to clean boot menu and check/clean mbr

I had successfully installed Windows 8 Consumer Preview on my mac mini (bootcamp install) but Windows crashed during the upgrade to Release Preview and I removed it a result. But there seem to be some ...
Shigar Kenze's user avatar
7 votes
8 answers
9k views

How to disable SIP when Big Sur or later macOS is installed in a VMware Fusion Player virtual machine

I have Big Sur installed in a VMware Fusion Player virtual machine. I desire to disable SIP. With an actual physical Mac, the usual method would involve first booting to internal macOS Recovery, then ...
David Anderson's user avatar
7 votes
4 answers
63k views

How can I install the newest EFI firmware upgrade from El Capitan?

I've got an early 2011 MacBook Pro (8,1) and I am trying to install the newest EFI firmware upgrade, however it only supports 10.8.5 and 10.9.5. Unfortunately I have no clue as to what the best ...
Ryan David Ward's user avatar
7 votes
2 answers
32k views

How do I enable Intel Virtualization in a MacBook Pro?

I tried booting into EFI by holding ⌥ Option⌘ CommandFO My end goal is to enable nested VT-x in VirtualBox.
Case39's user avatar
  • 397
6 votes
4 answers
20k views

GRUB 2 error – "fb: switching to radeondrmfb from EFI VGA"

Whenever I try to boot Arch, Mint or Debian Linux from a USB stick using GRUB 2 on my Mac with compatibility mode, it freezes on this error (given in the question title). I've tried every available, ...
LinuxMasterRace's user avatar
6 votes
1 answer
1k views

Can a Mac "boot" from the internet if the recovery partition is absent/corrupted?

This is something that has never been clear to me, and I can't find a clear and definite answer by searching the web (rather contradictory information). Can a Mac "boot" from the internet (...
PierU's user avatar
  • 183
6 votes
1 answer
9k views

Can't run EFI AHT - 'Cannot load 'EFI/Drivers/TestSupport.efi'

I have three early 2013 macbook pro logic boards, one will load apple AHT (apple hardware test), the other two produce the following error booting into diagnostics: Error: 8000000000000003, Cannot ...
polar's user avatar
  • 221
6 votes
3 answers
17k views

How to boot and install Linux or BSD on a 2007 MacBook White via USB?

I have an old MacBook white (Model 2,1 mid-late 2007) which won't upgrade beyond Snow Leopard (OS X 10.6). I have previously installed Debian with a dual boot by using rEFIt and booting from a DVD ...
Twisted Mersenne's user avatar
5 votes
1 answer
1k views

Secure erased drive - always one file can be found

I've been going through some old HD drives, secure erasing before sending to recycle. I periodically run Disk Drill over one of them, just to make sure I'm doing the job right. No matter whether I do ...
Tetsujin's user avatar
  • 116k
5 votes
1 answer
15k views

Not able to mount EFI partition with diskutil after installing Ubuntu

I installed Ubuntu as dualboot for a specific task to a 30 GB partition. It worked, however I found out I could do the same thing in macOS, so I removed the 30 GB partition. I also wanted to remove ...
user avatar
5 votes
1 answer
8k views

EFI Partition Change name and Logo

I've installed Windows again but this time on a external SSD. it's all working fine, but when holding the alt/option key it's giving me Macintosh HD and EFI partition. how can I change this name "EFI ...
Jeffrey_Jeremia's user avatar
5 votes
11 answers
7k views

OSX Boot drive selection screen is slow, un-responsive and takes forever to load in Macbook Pro (early 2015)

I have a Macbook Pro Retina 13" (Early 2015) and I have a bootcamp partition with Windows 10 installed in it. Also, there is an Ubuntu Linux on another partition, so it’s a triple boot computer. ...
Anton Jebrak's user avatar
5 votes
3 answers
7k views

How to create linux USB discs that do work on Apple Macs?

It seems that there are several problems releated to incompatibilities between Apple-EFI and UEFI that do prevent Apple users from easily using USB drives to install or even run other operating ...
sorin's user avatar
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5 votes
1 answer
29k views

What does boot.efi actually do?

I understand that when a Mac's EFI system runs, it locates the file boot.efi in the /System/Library/CoreServices/ (blessed) directory and runs this as an EFI application (subverting a large part of ...
user avatar
5 votes
1 answer
2k views

rEFInd installation won't boot due to T2 security, despite T2 security being disabled

I've been trying to install rEFInd with --ownhfs on my Macbook Air 2019, but booting into it results in Recovery Mode starting with the message A software update is required to use this Startup Disk. ...
kouwei32's user avatar
  • 435
5 votes
2 answers
2k views

Why does Refind break when upgrading from Mac OS High Sierra (HFS) to Mojave (APFS) on NVMexpress Macs?

Problem: NVMExpress Macs that have Refind do not see the APFS container and I cannot boot into my mac. Also, apologies to those who were aware of this solution, but I faced this issue along with ...
chrisdahfuh's user avatar
5 votes
1 answer
2k views

Replacing macOS with elementary OS. Computer boots normally into elementary OS, but boot menu (option key on boot) doesn't show anything

I want to replace macOS with elementary OS on a Mac. I formated the entire hard disk, inserted the elementary OS bootable USB, selected EFI boot on the boot loader (only option) and installed ...
Daisuke Jigen's user avatar
5 votes
2 answers
25k views

Uninstall rEFInd 0.8-3.7 on Yosemite

I recently tried installing rEFInd on Yosemite using the command ./install.sh --alldrivers however it would not recognise the ubuntu 14.04 x64 for Mac disk I made and so I would like to uninstall ...
iProgram's user avatar
  • 4,630
5 votes
6 answers
5k views

How can I install both Windows 7 and Windows 8 on a Mac Mini 2012?

I'm a developer, and I'm working on a cross-platform app that have to run on Mac OS X, Win7 and Win8. Unfortunately it's impossible to test my app in VM due to some hardware restrictions, so I have to ...
Kentzo's user avatar
  • 371
5 votes
1 answer
17k views

How to transform an Apple Mac Mini intro a reliable Ubuntu Server?

This question is about what steps are needed for transforming an Apple Mac Mini into an Ubuntu server. Here are some areas: installing Ubuntu and making it to be bootable from EFI by default enabing ...
sorin's user avatar
  • 29.9k
5 votes
2 answers
2k views

*Complete* recipe for installing single-boot Linux

What is a complete recipe for installing a modern (18/20/22) single-boot Ubuntu LTS on a Mac (Mac Mini, iMac, MacBook, ...)? My objective from selecting Ubuntu is to have a local Linux machine that ...
Calaf's user avatar
  • 4,359
5 votes
2 answers
12k views

Is it possible to reinstall MacBook firmware?

iOS devices have DFU mode, which enable one to completely reinstall the firmware and operating system. Do MacBook devices have something similar? Is the firmware automatically reinstalled upon an OS ...
Max Savin's user avatar
  • 151
5 votes
3 answers
40k views

How do I install rEFInd on a MacBook running macOS Sierra?

I've disabled SIP and tried to install rEFInd on my MacBook, which is not partitioned in any way by boot camp and is one single drive. The install of rEFInd says it is installing to /Volumes/ESP for ...
velvetxcat's user avatar
5 votes
2 answers
3k views

Do not show refit menu on boot (only with option key)

Is it possible to configure rEFIt so that the menu does not automatically show on my macbook when booting? I would like it to boot straight to OSX and only show the menu when I hold the option key, ...
user2105528's user avatar
5 votes
1 answer
9k views

Disk Utility says: "Error: This disk doesn't contain an EFI system partition."

After a clean install of Lion, followed by partitioning which again was followed by a installation of Ubuntu, I noticed some error messages of Disk Utitity. When verifying the volume I get told that ...
gentmatt's user avatar
  • 49.7k
4 votes
2 answers
3k views

Installed reFIT on Lion and now I can't login

I installed reFIT on my new MBP, and now, unfortunately, OSX can't get past the login screen. When I try logging in, it simply bounces me back to where I started, the login page. Since I can't get in ...
Naftuli Kay's user avatar
4 votes
2 answers
2k views

I have `/usr/bin/env` in my "Macintosh HD" but not in the recovery partition. Is this normal?

I'm working on a MacBook Air, that's currently booting to macOS High Sierra 10.13.6. It also has an Ubuntu 16.04 partition, that I am currently trying to reach. I was trying reinstall rEFInd, which ...
Clumsy cat's user avatar
4 votes
2 answers
16k views

Unsupported hack or workaround to get 64-bit OS X to install on a MacBook Pro having only 32-bit EFI?

I want to install the 64-bit OS X 10.7 on my MacbookPro 2,1, which has a 64-bit processor, but only 32-bit EFI and Kernel Boot mode. I know that this is not officially supported, but I assume there ...
Severin's user avatar
  • 178
4 votes
2 answers
1k views

Mac Partition won't boot after Bootcamp Partition Resize

I made a huge mistake. I resized my Bootcamp Windows Partition and messed up with my Mac partition; without any data, since my sister needed my backup hard drive for something urgent. To recover the ...
Thomas Gebetsberger's user avatar
4 votes
3 answers
8k views

What is Firmware.scap in the /EFI partition?

I'm looking at the /EFI partition, and it has 2 .scap file. /EFI/APPLE/FIRMWARE/MBP112_0138_B18_LOCKED.scap and /EFI/APPLE/EXTENSIONS/Firmware.scap They both have 2 files with GUID's that are ...
blanket_cat's user avatar
4 votes
1 answer
30k views

Disable wireless network card Mac OS X [duplicate]

I wonder if there is any way, how to turn off / disable the wireless network interface or driver, so I cannot connect to WiFi from running OS. I have MacBook Pro with OS X Mavericks. The reason for ...
Higgcz's user avatar
  • 43
4 votes
2 answers
10k views

Windows 10 EFI on MacPro 4,1 -> 5,1

I'm attempting an EFI install of Windows 10 on a 2009 (4,1) Mac Pro firmware upgraded to 5,1. I'm running High Sierra, and installing Windows 10 on a second partition on the same disk. I have no ...
vrl2's user avatar
  • 113
4 votes
1 answer
33k views

Create an EFI partition

I had the following problem with my internal HD. When I started my mac, after the logo loaded the screen went black and an error panel with the message: "Unapproved caller. SecurityAgent may only be ...
Luis Vera's user avatar
  • 173
4 votes
2 answers
4k views

Understanding firmware.scap

So, I recently acquired an old MacbookPro (v.5,4 mid 2009). I decided to create an Arch linux partition, and thus began my adventure... While installing rEFInd (the maintained fork of rEFIt), I ended ...
Confused N00b's user avatar
4 votes
1 answer
11k views

How do I change the default boot option on rEFIt?

I have two copies of OS X (10.6 and 10.7). By default rEFIt boots 10.6. However, I want to make it boot 10.7 instead. How do I do this?
sorin's user avatar
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