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 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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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
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 ...
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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 ...
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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
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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1answer
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*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 ...
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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. ...
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1answer
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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 ...
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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 ...
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0answers
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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. ...
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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, ...
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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 ...
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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/...
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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 ...
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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 ...
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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 ...
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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 ...
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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
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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1answer
236 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
440 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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952 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
451 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
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 ...
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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 ...
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1answer
8k 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
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 ...
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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 ...
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1answer
4k 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
798 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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1answer
47 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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53 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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1answer
122 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
57 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
1k 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
100 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
46k 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....