Questions tagged [efi]

Extensible Firmware Interface is a specification that defines a software interface between an operating system and platform firmware

Filter by
Sorted by
Tagged with
0
votes
1answer
37 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 ...
1
vote
0answers
21 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 ...
2
votes
1answer
28 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 ...
0
votes
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 ...
0
votes
2answers
67 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 ...
0
votes
2answers
22 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 (...
1
vote
1answer
172 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 ...
0
votes
1answer
123 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 ...
0
votes
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 ...
0
votes
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 ...
2
votes
2answers
621 views

MacBookPro8,2 late 2011 GPU fix with EFI: how to do it on Catalina macOS 10.15 (dosdude1 patch)?

This guide https://apple.stackexchange.com/a/295805/156133 is working fine on High Sierra. On Catalina installed with dosdude1 patcher (http://dosdude1.com/catalina/) I couldn't make it through, ...
4
votes
1answer
110 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 ...
10
votes
1answer
23k views

How to fix broken GPT, GUID and unmountable, no type volumes?

I have a Macbook Pro with retina, Yosemite and 500GB hard drive. I tried to install Windows using Bootcamp and accidentally deleted a partition, now my Mac cannot boot anymore. This is the output from ...
7
votes
1answer
6k views

How can I triple boot MacOS Catalina , Ubuntu 18.04, and Windows 10

I currently use the mid-2014 MacBook Pro. I have read the similar questions asked but as I don't have much technical knowledge I thought I should create a new question. Device History I had ...
1
vote
1answer
67 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 ...
1
vote
1answer
126 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 ...
3
votes
1answer
92 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 an Early-2011 Macbook 17". But it has an error. If you are doing an identical or ...
1
vote
1answer
195 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. ...
2
votes
1answer
194 views

How to resolve messed up GPT (FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF) from Ubuntu without data loss

I was having Ubuntu installed along with MacOS Catalina. I need windows for project work so I decided to create a partition and flash windows in it... Doing this I messed up and there was showing no ...
1
vote
0answers
46 views

MacBook Pro internal hard drive failure: Missing EFI partition

2 days ago as I opened my laptop (mid 2012 MacBook Pro running Catalina), it booted in recovery mode. Disk utility was showing me my internal hard drive and its partitions : disk0s1 and BOOTCAMP. ...
0
votes
0answers
187 views

How to rename and change icon of “EFI Boot” on Mac OS EFI manager [duplicate]

I have Windows on running on an external SSD for my Mac, but I am having difficulties renaming and changing the icon of my windows partition from "EFI Boot" to some thing else. Any help would be ...
3
votes
2answers
1k views

Can't update my Macbook firmware

Here is my very sad story. I have a Macbook pro 13" retina early 2015 (MB 12,1). My bootrom version is MBP121.0167.B07 and according to this ( https://docs.google.com/spreadsheets/d/...
4
votes
0answers
531 views

Macbook Air (mid 2012) Efi Firmware Downgrade –to original

I want to bring back my beloved Macbook Air 2012 (MBA5,2) to its 'original firmware'. I have identified the file as MBA51_00EF_B01.scap, which I extracted using unpkg over the downloadable offered by ...
4
votes
1answer
3k views

Understanding firmware.scap

So, I recently acquired an old MacbookPro (v.5,4 mid 2009). I decided to create an Arch linux partition, and thus began my adventure... While installing rEFInd (the maintained fork of rEFIt), I ended ...
1
vote
3answers
498 views

Is it possible to downgrade Boot ROM SW to try and fix unbooting Late 2012 iMac from Single User Mode?

I currently have 283.0.0.0.0 Boot ROM SW installed on my crippled Late 2012 iMac - which I upgraded HDD->SDD, tried to unsuccessfully install Mojave, then broke fusion setup, erased drives and am now ...
1
vote
0answers
155 views

EFI missing, Question folder appears, Mac SSD appears and disappears, what do I do?

Setup Macbook Pro retina 13 A1502, SSD 128Gb Running Yosemite, but currently doing the update for high sierra. Problem: Question marked folder appear after I left it for 2 days, battery run out (left ...
4
votes
3answers
7k 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 ...
2
votes
1answer
241 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 ...
0
votes
1answer
224 views

Confused over Mac Pro 1.1 EFI firmware 32 vs 64 bit: patch firmware or OS installer?

I have the original Intel Mac Pro 1.1 and I know it has a 64-bit CPU (Xeon), yet it has 32-bit firmware. However, I know that it's possible to patch it to run 64-bit OS, like OS X Mavericks (which I ...
9
votes
4answers
4k views

How can the average user easily validate the integrity of their Mac's firmware?

How can the average user easily validate the integrity of their Mac's firmware? Before you downvote this question or lecture me on how I am paranoid and no one should ever need to do that, please ...
1
vote
0answers
56 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 ...
0
votes
1answer
504 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 ...
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 ...
0
votes
1answer
197 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 ...
2
votes
2answers
1k 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 ...
5
votes
1answer
899 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 ...
1
vote
1answer
4k 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 ...
0
votes
1answer
208 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 ...
1
vote
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
369 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 ...
1
vote
1answer
1k 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 ...
3
votes
2answers
6k views

How do I keep the Recovery HD and EFI partitions from automatically mounting on my MacBook Air?

I've set Finder preferences on my MacBook Air running OS X 10.9.1 to show everything on my desktop: I've noticed that storage partitions called Recovery HD and EFI appear there: What are they? Is ...
1
vote
1answer
4k 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 ...
0
votes
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. ...
8
votes
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 ...
0
votes
1answer
1k 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 ...
0
votes
0answers
35 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 ...
51
votes
5answers
201k views

MacBook Pro: How to disable discrete GPU permanently from EFI?

I'd like to disable the NVidia GTX 750M GPU on my MacBook Pro 15" (Retina, Mid 2014, Mac OS X 10.10 Yosemite). I know I can use GfxCardStatus but I read I could have a more permanent solution by ...
0
votes
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
votes
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 ...