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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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 ...
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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 ...
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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 ...
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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 ...
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3 answers
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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 ...
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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 ...
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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 ...
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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 ...
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3 votes
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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 ...
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2 votes
2 answers
1k 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 ...
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6 votes
6 answers
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1 answer
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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! ...
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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-...
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1 answer
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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 ...
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1 answer
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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 ...
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1 answer
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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 ...
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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 ...
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5 votes
1 answer
1k 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. ...
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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 ...
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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 ...
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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 ...
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406 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 ...
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755 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 ...
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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 ...
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4 votes
2 answers
14k 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.
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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. ...
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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 ...
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1 answer
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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 --...
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648 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 ...
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1 answer
107 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 ...
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2 votes
1 answer
2k views

using rEFInd to get around lack of boot screen when using unsupported GPU in Mac Pro

I am trying to upgrade a 2012 Mac Pro (model 5,1) to Mojave. I have installed High Sierra and updated bootrom to MP51.0089.B00. I've got a required "metal capable" graphics card (Sapphire PULSE ...
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1 vote
2 answers
722 views

Dual booting, and lost rEFInd: how to recover OSX?

I mostly followed [these instructions][1] for how to set up dual-booting on my macbook, and everything seemed fine, up to the very last step. Now when I reboot the system (even if I hold command-R) I ...
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2 votes
1 answer
317 views

Triple boot: “Missing operating system” on Windows 10 partition after Windows update

I have a triple booted MacBook Pro (using rEFInd as boot manager). Recently I selected "Update and shut down" when finishing up in Windows 10. Since then, rEFInd still offers Windows to boot from, but ...
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1 vote
1 answer
2k views

Windows 10 on Imac mid 2011 High Sierra 10.13.6

Hi guys im trying to install windows 10 on my second internal hard drive ssd with a caddy. I have already done the usb boot but when i try to boot form the usb to install windows i receive a blue ...
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Change drives in Mac startup manager to display "Macintosh HD" instead of "EFI Boot"

I have a Mac Pro 3,1 running Catalina (patched by dosdude1's installer to work on my unsupported Mac). Initially, I was having problems with my GPU which led me to install OpenCore as per the ...
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1 vote
1 answer
254 views

Possible to use two HCI controllers concurrently?

I have a 2011 iMac with Bluetooth 2.1, and recently purchased a Bluetooth 4.0 USB dongle required for my new wireless mouse. The dongle works great - I paired my mouse and keyboard to it without ...
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3 votes
1 answer
2k views

How to fix EFI boot "Software Update is Required for this disk" when trying to boot linux? [duplicate]

I created a bootable linux USB following Ubuntu's tutorial. When I startup the machine holding Option an EFI Boot drive shows up. When I select it, it goes to Apple Logo Loading > Then Light Grey ...
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2 answers
2k views

rEFInd boot manager not showing EFI shell

After succesfully installing the rEFInd tool from https://www.rodsbooks.com/refind/ on a macbook with macos 10.15, restarting the laptop does bring me into the rEFInd boot manager. But the only option ...
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Windows 10 Boot Camp USB boots but throws 0xc0000225 before being able to install anything

I have a MBP 2014 15" with all the latest updates installed I downloaded the official Windows 10 ISO 64bit (20 november 2019 update) I verified that this ISO works, using Virtualbox I got a new ...
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5 votes
1 answer
5k 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 ...
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Can you recover recovery mode after erasing HDD?

I plug in a USB stick with Mojave macos installer. When I boot with Option key hold down, USB is not listed. I have tried different DMG images and different USB drives. Previously I erased macbook ...
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rEFInd won't show mac os or windows

I have a late 2014 mac mini on mac OS Catalina. I installed rEFInd on it, and when I restarted it, it showed the rEFInd logo, but nothing else. Can someone help me? I really want to keep using my mac ...
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1 vote
0 answers
1k views

Marking the EFI system partition on a USB flash drive as bootable

Using only MacOS (no GParted or other Linux utilities), how do I mark the EFI system partition on a USB flash drive as bootable? Insert an empty USB flash drive and launch Disk Utility Erase the ...
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2 votes
1 answer
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Will iMac boot chime play if there is no CPU?

So I got this iMac from auction, as is. The iMac chimes when I press the start button but the screen remains black. Is it possible that the iMac chimes if it has no CPU? I just wanna make sure if the ...
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