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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3answers
27k 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 ...
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0answers
1k views

Is it normal that there is an MS-DOS FAT32 partition in the hd not made by me? [duplicate]

Digging on my slowness my EtreCheck report.. report a 'sound me strange' MS-DOS partition Disk Information: ⓘ APPLE HDD HTS541010A9E662 disk0: (1 TB) (Rotational) [Show SMART report] ...
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1answer
429 views

Macbook Pro can only boot into EFI, how can I transfer files to my Macbook Air?

I have recently upgraded Disk Utility on my Macbook Pro. Now my device only boots into Recovery Mode and when I hold alt/option I can only see EFI. When I try to get into safe mode, I see a "No Symbol"...
2
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1answer
482 views

Unable to boot into macOS or Ubuntu after dd and partition reduction

I am on an early 2015 MacBook Pro with macOS Sierra, dual boot with Ubuntu 16.04. In macOS, I did dd if=/dev/disk1s3 of=disk2s2(if i remember correctly). It succeeded and I proceeded to shrink the ...
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1answer
1k views

Mac Pro 3,1 Non-Apple GPU upgrade but

I grabbed a forgotten MacPro 3,1 2008 Quad 2.8 and brought it back to life it had a ATI GPU but this turned to be dead. It's running pretty smooth after total clean up, but since I run with non-apple ...
1
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1answer
251 views

Can you blindly navigate the boot selector screen with a non-flashed video card?

I have a Mac Pro with a non-flashed video card. Yes, the video works just fine when the machine is booted (HD 270x). Since the card is not flashed, I obviously cannot see the boot screen. The problem ...
2
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0answers
361 views

What happens if you delete the contents of the EFI partition?

So, I was playing around with the diskutil command. Then I thought of mounting the EFI partition. It mounted successfully and I viewed its contents. When I right-clicked on a file I saw an option to ...
2
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1answer
2k views

edit efivars on MacOSX

On Linux, I can edit the efivars of my MacBookPro via /sys/firmware/efi/efivars/. E.g. here is a description to disable the AMD GPU via the efivars, which basically is this on Linux: printf "\x07\x00\...
2
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1answer
963 views

Rollback possibility reg. MacPro5,1 firmware update (High Sierra)

I've read quite some posts reg. eficheck; in itself it doesn't seem too "worrying" (for security reasons it's probably quite useful, but that's a bit off-topic here) I found this very interesting ...
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1answer
69 views

Testing EFI integrity under Linux

The utility in this article: High Sierra automatically checks EFI firmware each week looks like it will improve security on a Mac running macOS, but is it available for Linux too?
2
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1answer
3k views

What is involved in converting a PC video card to have boot screen on the Mac?

I've got a PC video card that I'd like to get boot screen support for on my Mac Pro. In particular, it is a Gigabyte R9 270X. The card is supported on the Mac once it boots, but I would like to get ...
1
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1answer
484 views

Mac Pro booting to Kali Linux screen without HDD installed

I'm in a bit of a predicament. Once upon a time, I installed rEFInd on my 2012 Mac Pro. I eventually removed it. I believe I also once tried to install Kali Linux in a dual boot environment. Fast ...
2
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2answers
5k 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 ...
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0answers
99 views

What process powers the progress bar during initial boot?

I recently learned that launchd was written and used starting with Mac OS X Tiger. Before it's inception the progress bar would actually give useful information about what process was currently being ...
2
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1answer
7k 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 ...
0
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1answer
4k 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
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1answer
19k 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 ...
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1answer
898 views

What should the permissions on the /EFI partition be?

Currently, I am able to mount and edit the EFI partition without any special privileges. Is that correct? I understand that the bootflags for SIP protected regions are stored in nvram which is ...
2
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1answer
4k 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 ...
2
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0answers
121 views

Firmware Password isn't the one I entered

So the firmware password isn't the one I entered. To avoid the usual onslaught of insinuations that it 'might not be my computer' that usually accompany questions of this nature, I want to state ...
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1answer
2k views

Can I use Clover on a real Mac Pro for device spoofing an unsupported AMD GPU?

I have a MacPro3,1 and a PowerColor R9 270 GPU that I would like to use together. Unfortunately, this card does not work out of the box unlike my previous Radeon 6870; I never flashed it, but I never ...
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3answers
10k 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 ...
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2answers
521 views

Clicked EFI volume kali installation, mac stuck

So, i was following this link -> http://docs.kali.org/installation/kali-linux-dual-boot-on-mac-hardware And i selected EFI volume instead of kali or macos. It went to a black screen! I force ...
4
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11answers
6k 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. I’m ...
0
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1answer
704 views

How to restore motherboard firmware on an unresponsive MBP mid-2009?

My EFI was version 1.7 and I downgraded it to 1.6 by following the instructions in the answer given on How to downgrade EFI firmware back to version 1.6. (I made it to the end of step 4 and heard the "...
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2answers
323 views

Create bootable USB with multiple installers?

I have a 64GB thumb drive and about a dozen or so installation ISOs I'd like to have on it. I would like to be able to have a single partiton, so that if I boot to it I am given a GRUB-stle boot menu ...
0
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2answers
3k 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. ...
0
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1answer
1k views

Can I enlarge the EFI Partition? And if so how?

I've been searching for this forever... By default EFI partition on Mac is 200 MB. I have a special Windows 10 image (enterprise compilation) I would like to install on the Boot Camp partition, which ...
0
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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 ...
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1answer
1k 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
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1answer
435 views

Error : unknown file system while trying to install Debian on my Mac mini

I'm running Mac OS X 10.6.8 on a Mac mini 2.1. The hard disk is 80 GB and the first half is occupied by the Mac OS X and on the second half I'm trying to install Debian. I tried to follow a lot of ...
0
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1answer
2k views

You cannot partition an external disk, a RAID disk or an internal disk on which FileVault encryption is in progress

I'm trying to Boot Camp my Mac Pro (Late 2013, MacPro6,1). You cannot partition an external disk, a RAID disk or an internal disk on which FileVault encryption is in progress. Restart your ...
0
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1answer
134 views

How to save data from broken GPT, GUID and unmountable, no type volumes?

I have a Macbook Pro mid 2012 and 750GB hard drive. I tried to delete Windows partition on the hard disk and now I can't access my main Mac partition (disk index 2) anymore. It shows something like "...
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1answer
3k views

Has anyone managed to put a GeForce 980m inside iMacs with MXM slots?

Here you can read about people trying to put non-Apple MXM GPUs inside iMacs: http://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/ Of course, there are issues due to EFI ...
2
votes
2answers
816 views

Accidently deleted some small sized partitions when installing Windows. OSX Partition wont boot

First off my problem is incredibly similar to this thread where the answer was almost reached but wasn't fully finished. Accidently deleted some small sized partitions when installing WIndows(Bootcamp)...
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1answer
1k views

Macbook EFI parition after reFind

I have a question about what should be located in the EFI partition of my macbook. A couple of years ago I dual booted ubuntu with reFind, however recently I erased my main partition to clean up my ...
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1answer
209 views

Mac Pro - Early 2009 - 4,1 wont boot under OSX

Having some issues with Mac Pro I’m hoping you can help with. I received a Mac Pro 2009 4,1 from my work place after a user noted it ‘it just died’ Our guys here looked at it and could only conclude ...
0
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2answers
884 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 ...
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0answers
130 views

Mystery: Filevault not prompting for password after hard drive removed and reinserted

I hooked up my 8,1 Macbook Pro's (A) fully Filevault 2-encrypted internal disk (El Capitan) to another Mac B (also El Capitan) externally to back it up. I had to input my Filevault password (every ...
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2answers
2k views

Downloading the Current EFI for the 2015 MacBook8,1 Model?

I checked the Mac product download pages and found no new firmware updates for the new 2015 MacBooks. I found many for the MacBook Pros, MacBook Airs, iMacs, and even the XServers, but the closest ...
2
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1answer
421 views

2010 iMac with new firmware IM112.0057.03B (2015-002) can't install windows 7-10 anymore

So I've been installing and uninstalling windows 7 and windows 10 since it came out on my iMac for a long time! My iMac does not have a dvd drive because I took it out. I've been installing windows 7 ...
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3answers
3k views

Permanently set Startup Disk to Windows without Boot Camp utility?

I have a 2011 Mac mini that I have completely removed OS X from and installed Windows 10 instead. Since Boot Camp only supports Windows 7 for this Mac, I did not use it. I just formatted the drive, ...
1
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1answer
770 views

How can I check if a new hard disk is detected by Mac EFI at boot?

I have a Mac Mini (late 2012) and have added a new hard disk drive in it. But Mac OS 10.10.5 is unable to detect it. If this were a PC, I'd check the BIOS to see if it was detected and listed there, ...
0
votes
2answers
899 views

Triple booting a modern Macbook (early 2015) with Bootcamp in EFI mode

So I need to have Windows 10, Linux and OSX on my Macbook pro early 2015 along with a shared data partition. There are several articles on the internet that say Boot Camp only works in so called "...
0
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1answer
871 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 ...
3
votes
1answer
5k 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 ...
2
votes
2answers
13k views

EFI Boot Windows 8.1 or 10 Install on MacPro4,1 / Mac Pro (Early 2009)

I would like to install Windows 8.1 or 10 on a separate single SSD disk in my MacPro4,1 (not yet flashed to MacPro5,1) using only EFI/GPT method. The machine has a 64Bit EFI (rEFIt reports version 1....
0
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2answers
4k views

How can I install Fedora Linux on a MacBook Pro, Model A1150?

I performed the following steps: Formatted a USB Flash Drive as: FAT32 Copied the Fedora Live ISO image to: /efi/boot/boot.iso Copied ISO 2 USB EFI Booter for Mac to: /efi/boot/boot.efi I then ...
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1answer
352 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
2k views

Mac OSX EFI problems, urgent help needed!

So, I recently did an update on OSX, booted my computer up and I discovered that I the update replaced my EFI boot rom and the SMC with the incorrect SMC, so now I can't use my battery and the ...