Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [efi]

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

1
vote
2answers
40 views

Is it possible to downgrade Boot ROM SW to try and fix unbooting Late 2012 iMac from Single User Mode?

I currently have 283.0.0.0.0 Boot ROM SW installed on my crippled Late 2012 iMac - which I upgraded HDD->SDD, tried to unsuccessfully install Mojave, then broke fusion setup, erased drives and am now ...
2
votes
1answer
87 views

Adding functionality to macOS pre-boot process

Is anyone familiar with adding functionality to the macOS pre-boot process? I'm trying to supplement FileVault's functionality so that it can integrate with a user directory service, which isn't ...
0
votes
1answer
30 views

Confused over Mac Pro 1.1 EFI firmware 32 vs 64 bit: patch firmware or OS installer?

I have the original Intel Mac Pro 1.1 and I know it has a 64-bit CPU (Xeon), yet it has 32-bit firmware. However, I know that it's possible to patch it to run 64-bit OS, like OS X Mavericks (which I ...
9
votes
4answers
3k 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 ...
1
vote
0answers
36 views

Bootable USB stick trying to install on USB instead of hard drive

So I‘m trying to install Ubuntu for Dual Boot on my MacBook Pro. I‘m running macOS 10.14 with APFS, created a new partition formatted as FAT32. Created bootable USB stick with Etcher and so forth. So ...
0
votes
1answer
109 views

Windows stop in the purple screen after Ubuntu installation

I have an external hard drive where I installed Windows 10 to use on my MacBook when needed. It works great, I just need to toggle the boot disk. But I had to install Linux. To do this I separated ...
0
votes
0answers
16 views

what are the EFI vars that need to be set for the screen to boot up to black instead of gray?

you know how some macs boot gray with grayer apple logo and newer ones boot up black with apple logo? that's what I'm talking about I don't have access to a macOS partition and I don't even remember ...
3
votes
1answer
4k views

Installing Ubuntu 16.04 server on Mac Mini 2006

I have liberated an old 2006 Mac Mini (Model: A1176) from being thrown away and wanted to use it as a Time Capsule for my other Macs. To do this, I want to install Ubuntu server 16.04 LTS to roll my ...
0
votes
1answer
80 views

Problems after deleting Bootcamp Partion/EFI

I am running High Sierra 10.13.6 on a MacBook Pro. To cut a long story short, I installed a release of Windows 10 on my Mac and did not like it. So I decided to delete it. I did my best to remove ...
1
vote
2answers
514 views

Is there a way to update a Mac to High Sierra or Mojave if OEM SSD is unavailable?

I have a late 2013 Mac Pro that had been running Sierra before its internal SSD died. I'd like to replace the internal drive, but OWC's site indicates the following: "macOS 10.13 and later versions ...
5
votes
1answer
414 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 ...
1
vote
1answer
2k views

How to upgrade boot rom firmware without an original drive

I have a 2015 MacBook pro that I am in the process of refurbishing. I purchased it used and it was missing many parts (wifi card, IO board, SSD). I have replaced all of these parts and purchased an ...
0
votes
1answer
63 views

Windows 10 won't install in EFI Boot mode when hybrid partitions are present on Mac-Pro 5.1?

I am trying to install Windows 10 in EFI mode on a Mac Pro 5.1, to co-exist with Snow Leopard, also installed in EFI mode, in GPT partitions, and Windows XP, installed in BIOS mode, in an MBR ...
1
vote
1answer
285 views

Boot Windows from USB with EFI password

I've created an USB with Windows 10 from where I can boot: Restart pressing option. Select USB EFI partition. Windows starts. When EFI password is active it will be asked when booting pressing the ...
0
votes
1answer
252 views

booting linux from external drive on mac

I had Linux installed on USB using pure EFI boot. I had been using this tutorial. Everything was working flawlessly to the moment of installing Windows using Mac Boot Camp. Now I don't see the EFI ...
1
vote
1answer
498 views

How to update the EFI firmware of a replacement logic board of a MBP mid-2015 to make it compatible with Mojave?

Apple has put me in a pickle. I had a lot of parts (battery, display, logic board) of my MBP mid-2015 replaced at the local Apple Store. When it was returned to me, it had a big new problem: it would ...
2
votes
2answers
6k views

How do I keep the Recovery HD and EFI partitions from automatically mounting on my MacBook Air?

I've set Finder preferences on my MacBook Air running OS X 10.9.1 to show everything on my desktop: I've noticed that storage partitions called Recovery HD and EFI appear there: What are they? Is ...
1
vote
1answer
1k views

Rename EFI Boot Partition “EFI Boot”

I am trying to rename my Windows / Boot Camp partition from "EFI Boot" to "Boot Camp" or "Windows". But I do not figure out where to rename. I tried bless command on the NTFS Volume, I tried ...
0
votes
2answers
2k views

Unable to get Intel HD 4000 graphics and audio working on EFI install of Windows 10 Bootcamp on Macbook Pro mid 2012

I have installed Windows 10 on my Macbook Pro mid-2012 (MacBookPro9,1) using the EFI method. Note: I am intentionally wanting to use Windows 10 in EFI mode instead of the legacy MBR/BIOS method. ...
6
votes
3answers
15k 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 ...
0
votes
1answer
572 views

Boot Camp Assistant stuck on creating partition due to EFI formatted as NTFS

Boot Camp Assistant is stuck on ‘create a partition’. I have followed the guide as answered in the question Boot Camp Assistance is stuck on create a partition? but it didn't work after step 8. After ...
0
votes
0answers
20 views

Update MacbookAIR Firmware without original hard disk [duplicate]

I got original SSD broken. My MacbookAir 7.1 got only YOSEMITE Internet Recovery. Now, I've bought a SAMSUNG 970 NVME M.2 disk and the system could recognize it using NVME kext patched but cannot boot ...
44
votes
5answers
156k views

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 ...
0
votes
1answer
3k views

EFI Partition seems to have been replaced, can still boot with rEFInd but need to repair EFI Partition

Somehow in the process of installing Ubuntu on an external drive I seem to have overwritten my EFI partition to an HFS+ format named "Ubuntu". With rEFInd installed I don't have any problems booting ...
2
votes
2answers
4k views

Mac Pro 5.1 Windows 10 EFI Boot (Separate Drive)

I've installed Windows 10 EFI with this Tutorial and it worked fine. But when switching from Windows to OSX using the Bootcamp "Boot to OSX..." it just rebooted into Windows again. Then I unplugged ...
6
votes
4answers
25k 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....
1
vote
2answers
3k views

How to change the GPT partition type of an EFI partition?

I have a perplexing problem with the EFI partition on my boot SSD. The GPT partition type is "Microsoft Basic Data". On all other drives in my system, including my Carbon Copy Cloner clone of my boot ...
3
votes
3answers
5k views

Efibootmgr command for OS X

I have successfully been able to install Linux Mint on my Mac. The only issue is I cannot select the boot partition holding option. To fix it I booted into linux and ran sudo efibootmgr -o 1,80. This ...
0
votes
1answer
1k views

Bless EFI/GPT Windows installation on separate HDD to boot on startup

There is a Windows 10 EFI/GPT installation on a separate drive in my MacPro next to my disk with the OSX installation. The Apple Startup Manager shows the Win10 disk labeled as "EFI Boot". I can boot ...
0
votes
1answer
821 views

Is there a way to disable a disk or disk controller before OSX boots?

Context: I use a mac for data recovery forensic operations, and for compliance with my users' requirements, I need to guarantee that no disk writes will be performed on a physical hard disk attached ...
0
votes
2answers
752 views

Mac Pro keeps rebooting when installing Win7 on Mac Pro using EFI Boot/GPT drive

I've tried to re-install Windows 7 using Bootcamp Assistent, since Windows 10 gave me a lot of headache. Ran in to the error "No bootable device detected...", so I used following steps: Make EFI ...
0
votes
1answer
139 views

Will updating macOS delete my kext configuration I have after disabling discrete GPU permanently from EFI?

I have followed all the instructions provided at MacBook Pro: How to disable discrete GPU permanently from EFI? My question is: Is it safe to update my macOS to latest High Sierra or even to Mojave ...
1
vote
1answer
258 views

Installed refind to a separate HFS+ partition alongside macOS 10.14, but can't set it as the startup disk

I use refind as my boot manager on my 2015 MacBook Air. Originally I had it installed on to my internal drive's EFI partition (and installed it in the recovery environment) but every time I update ...
0
votes
1answer
772 views

Grub on Mac via EFI (Linux: /dev/sda1 Darwin: /dev/disk0s1) (MacBook Pro Early 2011 if it matters)

I installed Debian Jessie 8.5 on my MacBook Pro over my old Bootcamp partition (Windows 8.1). I deleted the bootcamp partition with the partition manager in the Debian Installer and created two new ...
1
vote
0answers
828 views

Linux on Mac, dual-boot without rEFind EFI issues

So I followed the instructions here This actually worked great. I was able to install ubuntu and the dual boot is working, however, in my startup window I have a dummy Windows option that boots to ...
0
votes
1answer
709 views

Erased Windows partition with Disk Utility still can see the EFI boot on the boot screen

This the setup I had iMac 21 inch HDD (500GB) for macOS installation SSD (256GB) for Windows 10 installation This was working perfectly, until I upgraded to High sierra. After upgrading to High ...
0
votes
1answer
835 views

MacBook Pro Mid 2012 Windows 8 install on SSD

I am trying to install Windows 8, efi, on my SSD. I am getting the error code: 0xC0000005 "Windows installation encountered an unexpected error. Verify that the installation sources are accesible, ...
1
vote
1answer
274 views

Does resetting NVRAM reset EFI Boot Order?

I've had a Macbook Pro for a year or so now and have experimented with quite a few Linux distributions which have added and changed things in the EFI Boot Order. I am looking to clean things up. The ...
4
votes
3answers
4k 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 ...
2
votes
1answer
5k 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 ...
4
votes
3answers
13k 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, ...
0
votes
0answers
21 views

rEFInd text tool tips for boot menu

How can I customize the rEFInd boot menu so that there's text next to the various penguin icons? This is done through the label option? (I'm not at the MacBook presently, but planning ahead.)
5
votes
4answers
45k 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 ...
0
votes
0answers
186 views

rEFInd menu not showing

How do I bring up the rEFInd GUI? It was showing before, but now just directly boots into Mac OS. I've not installed Linux yet, but am preparing to do so. After using disk-utility now rEFInd seems ...
0
votes
0answers
307 views

partition failed with the error: couldn't unmount disk

After having resized the Mac partition through the CLI from: /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme ...
1
vote
1answer
2k views

Create bootable EFI system partition from macOS Installer's firmware files (.scap, .fd)

Any macOS installer contains a folder (e.g. called EFIPayloads) with EFI firmware files named MP61_0116_B17_LOCKED.scap, MBP114_0172_B09_LOCKED.fd or similarly. How does one create a working EFI ...
1
vote
1answer
446 views

How to resize Apple partition?

How to resize for Linux? /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *250.1 GB disk0 1: ...
0
votes
0answers
35 views

Simplest possible partition scheme for dual boot Linux?

I want to dual or triple boot an older MacBook. To partition, I can do that from the Mac OS itself? What partition scheme would I want, generally speaking. There are two GB of RAM. I want at least ...
0
votes
1answer
43 views

how to boot a from a DVD?

On a friends older MacBook, I'm holding the ⌥ Option key with a bootable DVD inserted but am not seeing a boot menu. I've tried rEFIt as well as some Linux DVD's I have lying about. I've checked the ...
4
votes
2answers
14k 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 ...