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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 stuck on Windows

My Mid 2010, Core 2 Duo MacBook recently just said NOPE. A month ago, I installed Windows on my Mac with the little cheat to install Windows 7. But I cannot boot back to macOS. I tried the drivers, ...
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21 views

MacBookPro12,1 BootCamp Windows 7 repair “GUID CODE: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF (Unknown)”

I am trying to fix my windows 7 MSR partition. Everything was working since I decided to install ubuntu. I was able to fix the boot partitions before but now I'm stuck. The image shows GUID of MSR is ...
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28 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 ...
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1answer
79 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 ...
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57 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 ...
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14 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 ...
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1answer
52 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 ...
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2answers
358 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 ...
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1answer
59 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 ...
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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 ...
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1answer
225 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 ...
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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 ...
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1answer
417 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 ...
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1answer
129 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 ...
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1answer
224 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 ...
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803 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 ...
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1answer
257 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 ...
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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 ...
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1answer
462 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 ...
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1answer
4k 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 ...
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1answer
380 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 ...
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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 ...
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20 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.)
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170 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 ...
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298 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 ...
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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 ...
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1answer
405 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: ...
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0answers
34 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 ...
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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 ...
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0answers
46 views

Old Mac Pro: Windows? GPUs?

I recently got an old Mac Pro 1,1 for free, and was wondering what's necessary to get it running Windows. I know that you needed Boot Camp before Windows 7, because it didn't support the EFI, but ...
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306 views

Ubuntu: Can't boot Mac, only shows a Folder with a Question Mark?

Bodhi Linux and Ubuntu 18.04 install fine -- but whenever I try to install Ubuntu Server onto this older Macbook it doesn't boot. Instead I get a question mark: Wouldn't even know where to begin to ...
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1answer
85 views

How to install Linux on a macbook? [closed]

How do I install Ubuntu from DVD? it's a 13 inch macbook, late 2008. Intel core duo, 2GB RAM.
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0answers
43 views

Multi-boot boot loaders missing after MacOS update

My MacBook Air (2017) currently has 3 OSes: MacOS, Windows, and Ubuntu (making it work was a nightmare). Yesterday when I opened up rEFInd, only MacOS and the Ubuntu stub loader (which, fortunately, ...
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1answer
658 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 ...
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2answers
76 views

Can I use different SSDs with different operating systems on a MacBook Pro?

I have an early 2013 Retina MacBook Pro with only a Windows 10 partition. MacOS is not currently installed on the machine. The Windows 10 partition is encrypted with BitLocker and because of the ...
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4answers
24k 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....
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3answers
14k 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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834 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
359 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"...
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1answer
345 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
789 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 ...
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1answer
153 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 ...
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0answers
330 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 ...
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1answer
1k 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\...
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1answer
735 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
61 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?
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1answer
2k 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 ...
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1answer
351 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 ...
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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 ...
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0answers
80 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 ...