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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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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58 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! ...
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24 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-...
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45 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 ...
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1answer
25 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 ...
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1answer
29 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 ...
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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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1answer
200 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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1answer
84 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 ...
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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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136 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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How do I edit name and logo for boot menu of Windows 10 EFI drive? [duplicate]

I have a new Windows 10 EFi formatted drive, and I am wondering what is the proper way to customize the boot menu logo and the name? For example, changing the orange drive logo to a picture, or ...
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68 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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733 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 ...
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228 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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78 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. ...
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186 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 ...
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1answer
77 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 --...
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163 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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43 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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34 views

How can I free up some space on my EFI partition for dual booting windows

I'm trying to free up my EFI system partition to install windows 10 I've done this Unable to install Windows 8.1 using Bootcamp, system volume doesn't contain required free space? but it only ...
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1answer
448 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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92 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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1answer
112 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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1answer
186 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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66 views

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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1answer
46 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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1answer
406 views

How to fix EFI boot “Software Update is Required for this disk” when trying to boot linux?

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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420 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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78 views

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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1answer
444 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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48 views

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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38 views

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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163 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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1answer
34 views

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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1answer
221 views

Cannot boot Ubuntu on a triple boot system (Catalina, Win10, and Ubuntu 18.4.4)

I am running a 2012 Macbook Air (5,2) with a 1TB SSD installed. I plan on using Mac as my main OS, windows for apps unavailable on mac, and linux for programming. Using the Mac Boot Manager (hold alt ...
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2answers
161 views

Thunderstrike 2 Mac Malware and other serious Apple exploits: how to effectively check?

As lowendmac in February 2018 reported, the Thunderstrike Mac Malware had been patched in 10.10.2, but it effectively has to be checked as some users and Macbook (Pro) models "never had the protective ...
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2answers
26 views

Mac not showing external flash drive with turnkey linux installed

I have been trying to setup a spare iMac (iMac12,2) that I have as a minecraft server, but whenever I try to make the flash drive installer, the mac doesn't recognize the drive in the boot picker (...
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1answer
517 views

How to install a second Win10 on a Macbook Pro 2019 with Catalina and Windows 10 already installed?

Since there is no real answer to this really specific case i hope someone here will be able to answer with detailed instructions on how to achieve this. I have a MacbookPRO (2019) and here is what i ...
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1answer
179 views

How to rebuild Mac partition showing unexpected GPT table size

I'm attempting to rebuild a Mac partition for an external 3TB Hitachi hdd that recently failed to mount. Apart from an unexpected GPT table size which I'll show later, this drive issue seems similar ...
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1answer
464 views

Mac Partition won't boot after Bootcamp Partition Resize

I made a huge mistake. I resized my Bootcamp Windows Partition and messed up with my Mac partition; without any data, since my sister needed my backup hard drive for something urgent. To recover the ...
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71 views

2009 Mac Pro does not boot after rEFInd

A few months back, I had a friend install rEFInd on my 2009 Mac Pro so I can use it as a server running a non-GUI version of Ubuntu. Though, after checking it a few months after it’s been off, the ...
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1answer
853 views

How to make a bootable partition from scratch?

What I want to achieve is to make a new bootable partition on my MacBook's SSD, so it should be possible to press Option key on startup and choose this partition to boot from. Why do I need that? I ...
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1answer
507 views

iMac SSD upgrade – Firmware password lock

My dad bought a used 21.5 iMac (2017) a few weeks back (previous owner bought it new but decided to sell after a week, so its basically new.) Given that it came with a 1TB fusion drive, we decided to ...
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1answer
170 views

How to customise rEFInd theme on High Sierra?

Installed rEFInd using the install binary. All working but the originally theme was a little uninspiring. So I followed following steps from this link. From OSX, do the following Start by ...
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1answer
139 views

*Complete* recipe for installing single-boot Linux

In this question I summarize a complete recipe for installing single-boot (this should be simple!) Ubuntu 18.04 LTS on a (possibly older) Mac Mini, iMac, or MacBook. But it has an error. If you are ...
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1answer
410 views

Dual boot with Windows 10 on 2011 Macbook Pro with APFS

I have been able to successfully dual boot a 2011 Macbook Pro with Windows 10 before when OS X still used the HFS file system, but things have obviously changed with how the system boots with APFS. ...
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1answer
92 views

Does Etcher replace rEFInd?

Installing Linux on a Mac has always been complicated by the need for running rEFInd. Yet Ubuntu's instructions for installing on a Mac mention Etcher (step 3), but do not mention rEFInd. Can you ...

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