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EFI ICLOUD BYPASS DONE RIGHT. This is a series created to help anyone interested in learning how to remove an EFI lock from any MacBook (Air, Pro, etc.). My goal is to make this as thorough and easy to understand as possible by giving you all the tools you'll need to get the job Done Right. These videos have been procured from an OS X point-of. Download Apple MacBook Pro Retina EFI Firmware 1.0 (Firmware). Download Apple MacBook Pro EFI Firmware Update 2.9. OS support: Mac OS X. Category: System Updates. MacBook EFI Firmware. EFI Clean Bin Firmware Files For Apple MacBook’s Air, Pro, iMac.Download/Unified. Apple released EFI updates separately, but since 2015 the EFI update is bundled in the software update Apple has been pushing out to users. However, if you are running one of the 16 Mac models identified by Duo Labs, there is a chance that your system hasn’t received any EFI update at all: iMac 7,1 to 10,1, MacBook 5,1 and 5,2, MacBook Air 2.
Until October 2016, Macs made sounds when starting up, to indicate their health or serious problems. On Intel-based models prior to the MacBook Pro 2016, the following sounds are possible:
- normal startup chime – memory and ROM appear good, normal startup will continue
- a single tone repeated every 5 seconds – no RAM has been detected
- three tones followed by a 5 second pause, repeating – installed RAM has failed initial testing
- three long, three short, and three long tones (the inverse of Morse SOS) – EFI ROM is corrupt and is being recovered
- one long tone when you hold the power button – EFI ROM update is in progress (Macs before 2012).
Much older PowerPC and Classic Macs are different again, and some flash the display rather than making error tones.
The great majority of problems with EFI ROM corruption occur when an EFI update is interrupted. Spontaneous corruption suggests that something even more serious is going on, and needs full hardware diagnostics.
EFI ROM updates only occur now as part of a macOS update. All models which are upgraded to run High Sierra receive a firmware update as part of that installation. These are usually listed in the Installations item in System Information, which will also give full details of the installed version.
If something goes wrong with an EFI ROM update, or the Mac loses power during the update, the Mac can be left with corrupt firmware, and may refuse to start up properly. If that happens:
- more recent models should automatically recover the EFI ROM after sounding the — … — tone,
- MacBook Pro 2016 models will not make any tones, but should also automatically recover the EFI ROM,
- old models, prior to about 2008-10, may need to be started up from a Firmware Restoration CD to restore the EFI ROM.
Once a recent model has sounded the tones indicating it has entered EFI ROM recovery, a progress bar should be displayed, during which recovery will take place automatically. Once complete, the Mac will restart normally and should function correctly again. If it does not, you can try resetting its SMC and NVRAM, as described here. A 2016 MacBook Pro should do the same, but in silence.
Older models require you to create a Firmware Restoration CD, provided by Apple in the form of a downloadable disk image, which you can then burn to CD with Disk Utility on another Mac. This process is detailed here.
For an iMac 5,1 or 6,1 and some other older models you should use CD version 1.4 from here. Other models require different versions of the CD, and you can see the range of downloads offered here.
If none of these help you start your Mac up successfully, you’ll need to get it to an Apple engineer, either through a Genius Bar or Apple support.
The latest MacBook Pro 2016 models with a Touch Bar introduce additional firmware, which is used by the processor which drives the Touch Bar. This has been updated as part of macOS Sierra updates, including 10.12.4. If that update does not complete properly, the Touch Bar firmware can be corrupted, which can leave your Mac cycling endlessly through crashing during startup, then restarting again – an infinite boot loop.
You should be able to break an infinite boot loop by entering Recovery mode, then repairing the startup volume. You may need to re-install macOS before the problem is fully repaired, though.
This article explains how to recover from a failed T2 firmware update, for iMac Pro and 2018 MacBook Pro models with Touch Bar.
(Updated 30 July 2018 to cover T2 firmware.)
macOS provides multiple methods to protect the data on a Mac: a user account password, encryption via FileVault, and optional low-level security measure that prevents starting up from storage devices other than the selected startup disk. That's known as the firmware password or EFI (Extensible Firmware Interface) lock, which will also block the user's ability to use all startup key combinations, except the NVRAM or PRAM reset combinations. This command (Option + Command + P + R), however, will initiate the machine from macOS Recovery instead.
The Lost Mode feature of Find My Mac will remotely lock the Mac with a firmware password for one-time use. The user's Mac receives the lock instruction from iCloud, restarts, and asks for the system lock PIN code that they set up. After entering the passcode the Mac starts up from the designated startup disk and disables the passcode.
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A firmware password is not the same as the administrator password or login password. It's a separate password that appears immediately after boot and must be entered into the system lock screen, which appears as a lock symbol on either a black or a gray background.
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Firmware Passcode Security
Low-level passwords are quite secure, which also means there is potentially a headache if the password is forgotten. If you or any of your users can't remember the firmware password or passcode, know that Apple doesn’t allow for any workarounds, but instead recommends scheduling a service appointment with an Apple Store or Apple Authorized Service Provider. The process requires the original receipt or invoice as proof of purchase.
Earlier versions of macOS required manual installation of the firmware but, starting in 2015, Apple began bundling EFI updates with the macOS updates in order to deliver security patches to all users. But as security firm Duo Labs discovered in late 2017, some Macs aren't getting the right firmware, which makes them vulnerable to hackers. They recommend checking the firmware version and updating if needed.
Firmware Passcode Location
On Intel-based Macs shipped before 2011, the firmware password was stored in the PRAM and read by the system EFI firmware before other PRAM variables. That lead to a serious security issue, allowing the firmware to be revealed in a native macOS app and weakening the enhanced security Apple had hoped to introduce with the addition of the firmware password.
In 2011, however, Apple added an important change to the system: the firmware password was moved to a separate programmable controller from Atmel. This component contains lockable flash memory to store the password and requires special programming with identifier numbers for both the Mac's motherboard and the Atmel chip to access and reset it.
Since the controller is an independent component, the only way to bypass it is to manually remove it from the motherboard, but this requires highly precise reflow soldering tools and techniques.
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Bypassing the Mac Firmware Password on MacBooks With Upgradeable RAM
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This hardware hack works on both Intel- and Motorola-based MacBooks and requires users to remove the RAM and reinstall it. You can check our guide on how to upgrade the RAM on Macs for further reading.
- Shut down your computer and remove the battery.
- Locate your RAM, remove one of the RAM modules and put it aside.
- Put the battery in, and boot your computer while holding the Command + Option + P + R keys to reset the parameter RAM.
- Wait for the chime to sound three times.
- Release the keys and shut down the computer.
- Remove the battery again, and reinsert the RAM module.
- Put the battery back in.
- Boot up your Mac, and you should not see the firmware lock again.
Disable the Password With Firmware Password Utility
- Restart your Mac while holding down the Command + R keys to enter Recovery Mode.
- When the Utilities screen appears, go the Utilities menu bar, and select “Firmware Password Utility”.
- Choose to turn the Firmware Password off.
If none of the above methods worked, there are still two more options to try: either have Apple do it for you, so long as you have the original receipt or invoice, or alternatively use any of the EFI lock bypass hardware kits available for sale on various sites. In using one of these EFI lock hardware bypass methods you’ll almost certainly void your warranty, so it is down to you whether you want to risk the procedure.
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