Questions tagged [bless]

bless is the command used to mark a disk as bootable by a Mac's firmware

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Problems with bless tool

The computer is an early 2015 13" MacBook Pro. Two weeks ago we sent my spouses 15" in for battery recall, and bought an OWC Aura Pro to replace my internal 1GB SSD (we SuperDuper'd her 15" MacBook's ...
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1answer
1k views

Bless error when installing rEFInd

I am trying to install rEFInd on my MacBook Pro 2018 laptop with the new T2 chip that adds extra boot security. I have both used APFS and MacOS Extended (Journaled). I have also disabled secure boot ...
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1answer
715 views

How does Bless work?

I'm getting an SSD for my wife's MBP 2010. I was planning to install the old HDD and the new SSD into my MacPro and just use disk utility to copy all the info from her old disk to the new one. It ...
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1answer
662 views

What should the permissions on the /EFI partition be?

Currently, I am able to mount and edit the EFI partition without any special privileges. Is that correct? I understand that the bootflags for SIP protected regions are stored in nvram which is ...
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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 ...
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2answers
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Using the -Bless Command on Multiboot Macs with 10.11 El Capitan

As part of our standard deployment, we tend to deploy multiple OSs on Macs, from 10.7 to 10.11. However, with the new SIP (System Integrity Protection), the -bless command no longer works properly. I ...
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2answers
420 views

Why can't new cloned hard drives be used in 2009 MBP 13"

Ok strange one this and really can't figure it out. Took out a dead 250gb apple (fujitsu) drive from 13" 2.53 intel core 2 duo (mid 2009) model. I cloned a copy of 10.6.8 using superduper to the new ...
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0answers
2k views

How to bless a partition using a custom EFI-boot file with non-conforming directory structures and/or file names?

Is there a guide on how to bless a partition for booting, one that doesn't have the default /System/Library/CoreServices/boot.efi structure? For example, I installed GRUB on the default EFI System ...
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1answer
2k views

Set EFI to boot Windows via (U)EFI one time

On my late 2012 Mac Mini, I have installed both Mac OS X Mavericks (with FileVault) and Windows 8.1 (natively, not via Bootcamp): /dev/disk0 #: TYPE NAME ...
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1answer
1k views

bless --nextonly parameter fails

I am using the bless command to reboot my Mac mini into VMware ESX. sudo bless --device /dev/disk3s1 --setboot --nextonly && sudo reboot Booting ESX works but after the next reboot the Mac ...