I'm looking at the /EFI partition, and it has 2 .scap file.




They both have 2 files with GUID's that are present in the other, however the contents of each are different.

The file with the GUID C3E36D09-8294-4B97-A857-D5288FE33E28 in /EFI/APPLE/FIRMWARE/MBP112_0138_B18_LOCKED.scap contains the text $IBIOS$ MBP112 88Z 0138 B18 1610201654 Copyright (c) 2005-2016 Apple Inc. All rights reserved.

However the file with the GUID C3E36D09-8294-4B97-A857-D5288FE33E28 in /EFI/APPLE/EXTENSIONS/Firmware.scap contains the text N $IBIOS$ ROMEXT1 88Z 0002 B00 0710231738

What is the Firmware.scap file, and how come when I delete it, nothing changes except that it boots faster?


I suspect the second file is a security update. The 1st one most certainly is a no-fly zone. Has to do with firmware I think.

However, never ever mess with your (U)EFI partition, or you may have a very expensive Apple doorstop on your hands...

Well, my own EFI partition is mounted here. You can mess around with it all you like on an external bootable USB stick.

I'm doing this just to see if I'm able to run an unallowed version of OSX on a very old, already scrapped Mac Mini.

OS bootloader seems to depend on (U)EFI, namely... Revive a broken bootloader/ EFI partition, and you may do wonders. I think.

Just look at this: http://xpcboot.weebly.com

Have fun, but don't break a working Mac...

  • Yeah, I've referred to bricking it attempting the fix as being the largest investment I'll have ever made in a door stop too. Verbatim. I'm finally heading back to US where I can just go to the apple store and (cringe) let somebody else fix it. Been talking the hackintosh crowd, they seem to think unibeast and clover may be my best bet. While I'm not risk averse by a stretch, the stakes are just too high for me. Thanks for weighing. I know now that this isn't the forum for this (type? depth?) of question. – blanket_cat Jun 21 '17 at 7:39
  • If you have another Mac at hand, you can easily undo any "damage" you do while trying this, I think. Just first make sure you can put your primary Mac into Target Disk Mode and then access it from your other Mac. You should even be able to boot your primary's Mac boot volume on your other Mac in case your primary Mac won't boot on its own any more. If you use a disk editor like iBored, you can then first save your EFI partition, then try your mods, and eventually restore the original one. I've done that many times. Though, most modern Macs do not even need the EFI any more to boot. – Thomas Tempelmann Jul 16 '18 at 11:27

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