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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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Make a bootable Mac USB (NOT AN INSTALLER) on a Late 2020 M1 Mac

I am wondering if you can make an USB bootable without using a Bootable MacOS Monterey, Ventura, etc. I am asking you guys, if I have to add some special EFI partition with files in the USB or if I ...
Mousey's user avatar
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3 votes
1 answer
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How to fix script which requires EFI System Partition (ESP) to be disk0s1 in macOS?

I see a post which is 12 years old: How to fix broken EFI partition? System: Macbook Pro 2019 with Intel & T2, upgraded to Sonoma. Objective: Dual boot with T2Linux Fedora using https://t2linux....
tom_kp's user avatar
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2 votes
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How to completely remove MacOS (Ventura) from Macbook Pro 2019 with T2, and install Linux? [closed]

System: Macbook Pro 2019, Intel, T2, 16 GB RAM, No USB port (Using VIVA USB hub), Ventura 13.6.5 Issues: (1) Hash Volume Mismatch (2) Not re-installing MacOS (3) Bootable USB Drive is NOT showing up ...
tom_kp's user avatar
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1 vote
0 answers
23 views

Change EFI label for external volume

I am booting a retrogaming system (Recalbox, linux-based) on my Macbook Pro 2009 (Intel, El Capitan) from an SD card (FAT format). The SD card is currently displayed as "EFI boot" upon boot ...
vviinnzz's user avatar
1 vote
1 answer
216 views

Mac OS X EFI and installing rEFInd on SD card with Linux OS

I have a MacBook Pro (2013) running Sierra on the internal SSD. I’ve installed Debian12 onto an SD card. Upon boot (by holding down the Alt key) it doesn’t show an option of EFI Boot. But having ...
101rabb1ts's user avatar
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0 answers
212 views

Is there any efibootmgr command-line equivalent in MacOS to see bootable targets?

I found this text in a book (on linux) and i was wondering if there is an equivalent in MacOS. "To determine if your system uses a BIOS or UEFI, run efibootmgr. If you get a list of boot targets,...
nostromo's user avatar
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1 vote
1 answer
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Macbook Pro x86_64 Triple-Boot: How can I fix EFI boot and Startup Manager

Summary I successfully created a triple-boot on my 2015 MBP with macOS (Big Sur), Ubuntu 22.0.1, and Windows 10. I can boot into any of the 3 successfully, however, the Startup Manager does not show ...
DR Northbay's user avatar
0 votes
1 answer
295 views

Restore partitions table

Just tried to install Windows on an external SSD, but mistakenly deleted partitions on a Mac SSD from the Windows installer. I had 2 partitions: Macintosh HD (APFS) MacData (ExFat, ~108 GB) So I ...
Denis Kuznetsov's user avatar
0 votes
0 answers
74 views

Are there keyboardless options to enter macOS Recovery Mode? (possible broken by bad Windows EFI purge)

I acquired a 2009 iMac that had a Windows partition which was apparently erased during formatting to be sold. The computer now tries to boot, via EFI, the missing Windows partition as default. I can ...
beachboy'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
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1 vote
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M1 MacBook Pro EFI Lock system PIN unlock situation on Monterey OS update

My M1 MacBook suddenly rebooted and locked asking for 6 digit system pin. I think it happened during macOS Monterey update on a public WiFi. Apple store didn't help as they couldn't confirm the ...
Alex's user avatar
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1 vote
1 answer
2k views

No BOOT folder found in EFI partition

Excuse me if this already have answers elsewhere. My problem is that I cannot find the BOOT folder in EFI partition, the only thing exists is the APPLE folder. This is quite strange as I see in almost ...
ElevenLee's user avatar
0 votes
0 answers
38 views

Startup key combinations don't work after disk swap, cannot boot into live installation media

I recently replaced my old iMac's HDD with an SSD. The SSD had a Linux distribution installed in it, but I didn't bother formatting it because I knew it would be formatted during OS installation. I ...
Marwi's user avatar
  • 185
10 votes
0 answers
9k 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
  • 201
0 votes
1 answer
356 views

Can I reset my firmware password manually or using third party tools? [duplicate]

i forgot my firmware password on my macbook air 2013,i was tempting to replace my .efi file, but online articles says its too risks my machine can be corrupted forever. any idea on how i can solve ...
james's user avatar
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2 votes
1 answer
3k views

Rename EFI boot entries (MacBook Air)

I can't figure out how to rename boot entries on a MacBook Air 2012, i.e. those that appear when holding alt during boot. The problem was initially that my EFI Ubuntu installation could only be booted ...
Andreas's user avatar
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1 vote
1 answer
541 views

Disk Utility deletes my Windows EFI partition

I am trying to multiboot Windows, Linux and macOS Catalina all installed on the same drive. I can get it working quite easily if macOS is the first OS on the drive. However I have problems if my drive ...
FlexMcMurphy's user avatar
1 vote
0 answers
922 views

How to use gpt to fix corrupted APFS container?

My 1TB SSD failed on me with what appears to be a corrupted APFS container. I found a post here on stackexchange that suggests to remove and create GPT entries but the values in the example are ...
AshFriedrich's user avatar
2 votes
3 answers
3k views

Mac EFI partition in wrong place (disk0s2 not disk0s1)

Here is my problem: My EFI partition works fine, but it is in the wrong location (it is at disk0s2 instead of disk0s1 as you will see in the picture). How can I fix this? I do not want to delete both ...
Milena Rode-Kotzé'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
2 votes
1 answer
4k views

My MacBook Pro keeps crashing while trying to reinstall; how can I figure out what's wrong?

My MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) has been crashing during startup for the last four days. It was running macOS Big Sur. My MacBook froze while I was using it, then suddenly ...
Martin's user avatar
  • 23
2 votes
1 answer
200 views

Removing free partition on Macbook Macintosh HD

Let me tell you the story to understand the problem. I installed Ubuntu 20.04 on my mac as the second OS. Later I decided to delete it, and being not good in all this stuff, I decided to just remove ...
John Anthony's user avatar
3 votes
1 answer
791 views

How can I use rEFInd boot manager without an enter key?

I have a MacBook Air (11-inch, Late 2010) (it’s old I know) and I have installed rEFInd on an USB. The thing is, my return key does not work, so rEFInd is basically useless. Is there any way rEFInd ...
Ahmed Shihabdeen's user avatar
2 votes
2 answers
2k views

How to invoke a UEFI Shell (v2.2) on a Fusion Player virtual machine with Big Sur installed?

I am using the current free version of VMware Fusion Player (Version 12.1.0). I have created a Big Sur virtual machine to do some testing, which involves modifying NVRAM variables. This version of ...
David Anderson's user avatar
7 votes
8 answers
10k 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
1 vote
0 answers
278 views

Wireless headphone experiences audio interruptions when many devices are connected to Bluetooth. Can I use two HCI controllers on my iMac?

Computer: iMac (27-inch Late 2013). OS: macOS: 10.15.7 I need to connect 3 devices (magic keyboard, mouse and trackpad) to the internal Bluetooth module and 1 device (wireless headphones) to an ...
user5589349's user avatar
0 votes
1 answer
965 views

MacBook main volume can't be mounted during boot

MacBook 7.1 (white unibody) from 2010, I have upgraded to a new SSD some years ago. During startup the MacBook turns off when the loading bar is at about 80%. Booting in verbose mode I can see the ...
zaddo's user avatar
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1 vote
1 answer
406 views

Why isn't Startup Manager showing Ubuntu Netboot USB - mid 2010 imac 21.5"

Apologies if this question is inappropriate for this forum I am not sure whether I should be on the Apple or Ubuntu StackExchange. I am trying to turn an iMac mid 2010 21.5" into a home server by ...
Ambassador Kosh's user avatar
0 votes
1 answer
246 views

Do the Mojave or Catalina patchers support AMD PC GPUs or do you need a flashed card for this?

In the past, I had used dosdude1's High Sierra patcher to get macOS 10.13 on an older Mac Pro. However, the GPU in this machine is a non-flashed AMD R9 270X, so I couldn't get a boot screen and had to ...
bjb's user avatar
  • 2,546
1 vote
1 answer
2k views

Mid-2012 MBP Bootcamp Installation

I have been trying unsuccessfully for the past few days to install Windows 10 on my mid-2012 15" MacBook Pro. I've read a few different sites (including this one), but I am just struggling to ...
Aaron Peace's user avatar
0 votes
0 answers
197 views

I'm not sure I can flash the firmware rom on Mac Pro 1,1

I'm trying to port coreboot to the Mac Pro 1,1 and I'm finding it difficult to locate any information on how to use the diag/lpc or other ports to flash firmware on the Mac Pro 1,1 or 2,1. I am ...
Trusted's user avatar
2 votes
1 answer
20k views

How do you create a rEFInd boot manager USB disk?

The following command does not run, it returns a "file not found" message. The instructions do not say where the downloaded file should be placed, nor whether it should be unzipped or not! ...
Steven Salemi's user avatar
0 votes
1 answer
285 views

Dual boot (old model) MacBookPro9,2 running new macOS (APFS) without rEFInd

Is it even possible to dual boot macOS without using rEFInd? In my system, I have a EFI, APFS and Ext4 partitions storing ESP, macOS (either Mojave or Sierra) and Debian. I used to be able to dual-...
hyiltiz's user avatar
  • 101
4 votes
1 answer
386 views

Can I set an arbitrary nvram variable using rEFInd?

Is there any way to customise the rEFInd bootloader to set a custom nvram variable, either in refind.conf or any other way? Specifically, I'd like to set a value for the boot-args variable. It seems ...
MikeBeaton's user avatar
2 votes
1 answer
8k views

how to show all boot options and then hide them from rEFInd?

I believe I have rEFInd running When it’s active, refit and a duplicate windows partition show up. (i have kali, windows 10, and OS X catalina) and then choose JUST those three to boot from, but ...
Noah Earley's user avatar
1 vote
1 answer
706 views

Is it possible to make a mbr legacy bootcamp win 10 from a gpt partitioned catalina hdd 10.15.7 with bootcamp 6?

I tried to install win10 to ssd via efi boot on my macbook air 2012, it ran pretty well as far as performance, but because it's pre-uefi it makes it the garbage windows version with no sound, no ...
Toddd's user avatar
  • 61
0 votes
0 answers
40 views

I cloned a Windows 10 laptop to an external SSD running on a pre-UEFI MacBook Air 2012

I have no audio on my MacBook Air under Windows 10. Also some other problems typical for pre-UEFI MacBooks. I'm going to try to fix through DSDT (whatever that is) following this tutorial. ...or using ...
Toddd's user avatar
  • 61
5 votes
1 answer
3k 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
  • 445
1 vote
1 answer
1k views

How to disable Boot Camp and prevent any other OS installations?

Is it possible to completely block the use of Boot Camp such that the current Mac OS installation is the only OS available to use? This is for T2 security chip enabled Macs specifically. I found this ...
Jon's user avatar
  • 111
1 vote
1 answer
2k views

EFI Boot doesn't work when trying to boot windows from my Mac

2 years ago, I installed Windows on a external SSD to be booted from my Mac. It used to work well. I would plug my external SDD, hold the option key at the beginning and chose if I wanted to boot on ...
Logan Sulpizio's user avatar
0 votes
0 answers
124 views

Dual boot Mac with Ubuntu using rEFInd - removed Ubuntu by deleting partition and now Mac won’t boot

I had installed Ubuntu on Mac with rEFInd dual boot. I was able to use it until I thought to remove the Ubuntu. I deleted the Ubuntu Partition from drive, and then thought it will just remove Ubuntu ...
Random Guy's user avatar
0 votes
1 answer
594 views

How to make Mac Partition boot again on Catalina/Ubuntu 20.04 Dual Boot?

I am using a 2011 MacBook Pro 15", this is the model with the AMD GPU problems and I have used the NVRAM modification to disable the AMD GPU and then Dosdude's patch to install Catalina. This is ...
Simon Baldwin's user avatar
1 vote
0 answers
1k views

How do I access my iMac in Target disk mode from Terminal running on my Firewire-connected MBP, to troubleshoot iMac possible rEFInd boot problem?

I want to uninstall rEFInd in a peculiar situation. I overheated my ageing iMac doing a Zoom chat while running other programs. It crashed. Since when it won’t reboot and there are lines on the ...
rico1's user avatar
  • 21
5 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
  • 211
8 votes
2 answers
34k 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
  • 407
0 votes
1 answer
702 views

Wierd problem after doing a triple boot OS-X, UBUNTU 20.04, KALI-LINUX

I've successfully did a triple boot on my Macbook-pro but somehow even after creating separate EFI partitions, all my grub files ended up in the first EFI partition. So I separated them manually. ...
Drazer's user avatar
  • 5
0 votes
1 answer
2k views

Separating EFI partitions of Ubuntu 20.04 and Mac OSX on Macbook Pro

I installed Ubuntu 20.04 alongside OSX on my early 2015 Macbook pro by following this answer. And somehow I messed up. I created a separate 400MB EFI partition for Ubuntu but, the system automatically ...
Drazer's user avatar
  • 5
1 vote
1 answer
305 views

Every Ubuntu update breaks rEFInd on my MBP

Every time when I'm updating Ubuntu with: apt-get update && apt-get -y upgrade I've needed to do this in MBP recovery mode: mkdir /Volumes/EFI mount -t msdos /dev/disk0s1 /Volumes/EFI bless --...
tchspprt's user avatar
2 votes
0 answers
790 views

Deleted EFI partition & "critical software update is required for your mac but an error was encountered" re-install EFI or Touchbar?

So I've made the stupid mistake of deleting the EFI partition when reinstalling my 2016 MacBook Pro with TouchBar. I now get an error when reinstalling the MacOs "a critical software update is ...
Mandeep 's user avatar
0 votes
1 answer
159 views

Would this loophole for stolen MacBook Pro Retina work, or can macOS detect this and stop it?

Imagine a Late 2013 Retina MacBook Pro. It's got FileVault 2 enabled, it's been shut down (so the disk is encrypted) and the EFI Password is set, so they can't boot from another disk or reinstall ...
SYGMAH's user avatar
  • 181

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