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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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
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 ...
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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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0answers
48 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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0answers
337 views

What happens if you delete the contents of the EFI partition?

So, I was playing around with the diskutil command. Then I thought of mounting the EFI partition. It mounted successfully and I viewed its contents. When I right-clicked on a file I saw an option to ...
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0answers
82 views

What process powers the progress bar during initial boot?

I recently learned that launchd was written and used starting with Mac OS X Tiger. Before it's inception the progress bar would actually give useful information about what process was currently being ...
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0answers
113 views

Firmware Password isn't the one I entered

So the firmware password isn't the one I entered. To avoid the usual onslaught of insinuations that it 'might not be my computer' that usually accompany questions of this nature, I want to state ...
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0answers
951 views

Mac Pro, Boot into OSX without EFI after Bootcamp

I have a Mac Pro, early 2008. I installed Windows 10 using bootcamp. The mac came with an 8800gt, but I had a GTX680 from my other PC which I put in the mac, it is not the mac version so I don't get ...
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20 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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42 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 ...
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851 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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0answers
108 views

Mystery: Filevault not prompting for password after hard drive removed and reinserted

I hooked up my 8,1 Macbook Pro's (A) fully Filevault 2-encrypted internal disk (El Capitan) to another Mac B (also El Capitan) externally to back it up. I had to input my Filevault password (every ...
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552 views

Does Apple's EFI patch Thunderbolt devices to Windows 10?

So, I've been rattling with myself about this for a bit. I've followed 5SH-2a's guide of EFI Bootcamp to no avail. I decided to try it on my own, by mapping an NTFS Partition on my hard drive to a ...
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0answers
6k views

rEFIt boot changed after update to Yosemite

I was using rEFIt to work with Ubuntu with my Mac. After the upgrade to Yosemite I had a problem with rEFIt. I found the following solution on ubuntuforums.org but rEFIt still didn't work: cd /efi/...
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1k views

Accidentally Removed EFI Partition

I removed the EFI partition accidentally but I have it on a Time machine backup. Is there a way to simply move it from my external drive to my boot drive. I've tried restoring the format of the boot ...
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377 views

Impossible install Mac OSX, probably firmware damaged

Yesterday evening I install update on my MacBook Unibody (Version 6,1; Late 2009). The update run on Mac OS X 10.8.5 consist in security update and new version of Safari and iTunes. The update is run ...
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477 views

Replacing OS X with Linux or Unix, and making the switch to Tiling Window Managers

I have a Macbook Pro 8,2 and really want to make the switch to something a little less stubborn and a little more flexible than the proprietary Mac OS X. I am a bit frustrated with MacPorts lately and ...
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317 views

Corrupt EFI Partition or Error b/c of Encryption? & Ghost Partition

I have a 2012 Mac Mini Server with two internal SSDs. Until recently, I had Mt. Lion installed on one of the SSDs, as my only boot drive, and used the other, rarely, for file storage. I created a ...