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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If you’re using a Mac that’s running macOS Catalina, go to the Apple menu and choose Lock Screen or press Command+Control+Q. This will lock your Mac and return you to the Login screen. For older versions of the operating system, press Control+Shift+Power button (or Control+Shift+Eject if your Mac has an optical drive). Just like MacID for iOS, MacID for Apple Watch allows you to lock and unlock multiple Macs, control iTunes & Spotify, and even start screensavers – right from your wrist. Add the MacID Glance near the start of your Glances for super quick access and a quick look at how many Macs you have connected.
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.
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.
Bypassing the Mac Firmware Password on MacBooks With Upgradeable RAM
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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- Updated on 2020-10-27 to iPhone

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My iPhone is added into blacklist by AT&T and after that I’m unable to use it. What can I do to make it working again?
Are you in trouble with iPhone carrier’s network? If the answer is yes, then you understand the ache of carrier restriction. In that case, is there any simple solution such as free iPhone unlock service to remove the network lock on your iPhone so that you can use it on the network permanently? Actually yes! In this topic, I am going to show you the top 7 best free or paid iPhone unlock services of 2018.
Part 1. Top 7 iPhone Unlock Services to Unlock iPhone Free
1. iPhone IMEI
Website Address: https://iphoneimei.net
For America, United Kingdom and Canada users, we recommend this website to you. This page provides the free iPhone IMEI checker and unlocking service for you. The iPhoneIMEI team promises to unlock iphone 6 for any carrier by whitelisting the IMEI. It is available on all iPhone models and iOS versions. After the help of this service, your iPhone IMEI is going to be whitelisted from Apple Activation Database. It’s said that the unlock service is totally legal. What’s more, you don’t have to jailbreak the iPhone. For supporting this service, you need to select your iPhone model, the carrier that lock your cell phone, and finally type your IMEI number.
2. Cell Unlocker
Website Address: https://www.cellunlocker.net
This service offers the forever unlocking solution and is able to set your SIM card free after filling out your mobile phone details. All you have to perform is to submit your IMEI and iPhone model. And then it will help you unlock iPhone(free) service, and then you plug in your iPhone with a Windows or Mac personal computer, run iTunes and your service will be unlocked successfully.
3. Free Unlock 24
Website Address: http://freeunlock24.online
This little site provides the free, easy and permanent method to factory unlock iPhone without jailbreaking within several minutes. After getting help from this service, your iPhone wouldn’t be locked again even though you update device in iTunes. It won’t void warranty of your phone so you can use it safely. The shortcoming is that it doesn’t support iPhone 8/8 Plus and iPhone X at present.
4. iPhone Full Unlock
Website Address: https://www.iphonefullunlock.com
This service provides the lifetime unlock service for your iPhone. After using this service, you are capital of changing Network Provider on your unlocked iPhone at ease, especially when you are travelling abroad and want to transfer to cheap service from another Cell Provider. You don’t have to anxious about it getting relocked after connecting with iTunes or performing a restore. It supports iOS versions from latest to lowest and even firmware version.
5. Global Unlock
Website Address: http://www.globeunlock.com
In this page, you just have to get start using its service with 3 simple steps. First and foremost, type your iPhone information, such as country and network where it is locked. Secondly, share this website with your friends on Facebook, Twitter, Google, or Pinterest. Eventually, you are about to receive an Email with instructions on how to enter the unlock code for your iPhone.
6. Official iPhone Unlock
Website Address: https://www.officialiphoneunlock.co.uk
This service is based on United Kingdom but the IMEI-based SIM unlocks is working wherever you are from. It offers the official factory IMEI-based unlock for all iPhone models, iOS version and all modem firmware. By whitelisting your IMEI in Apple iTunes database, you can choose your iPhone with any LET, GSM or CDMA carrier around the world. Do not miss this iPhone IMEI unlock(free) service.
7. UnlockBoot
Website Address: https://store.unlockboot.com/
UnlockBoot is a worthwhile iPhone SIM unlock service that can permanently unlock iPhone X, 8 Plus, 8, 7, 7 Plus, 6, 6S, 6S Plus, 5, 5C, 5S, 4 or 4S which are locked to the AT&T, Sprint, T-Mobile, Xfinity and Verizon network. Once the iPhone Unlock is done, your device will be operational on any carrier network.
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Bonus Tips: How to Unlock, Remove or Bypass iCloud Activation Lock on iPhone
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There are times when your iPhone is locked with Apple ID and you can't unlock or activate it. This could happen when you forgot your Apple ID or password, or when you bought a second-hand iPhone that is linked to the previous owner's Apple ID. So, how to unlock iCloud activation lock without Apple ID? Here you can use iCloud activation unlocker tool to remove the Apple ID without password.
UltFone Activation Unlocker is a legal tool to remove the iCloud lock. The main features of this software include:

- Remove iCloud lock without prevous owner.
- Turn off Find My iPhone without password.
- Help you access your device after being hacked.
- Support iPhone 5s to iPhone X.
- Supoprt from iOS 12 to iOS/iPadOS 14 (iOS 14 for iPhone 6s/6s Plus/SE 1st/iPad 5th/iPad Mini 4/iPad Pro 1st).

It is worth mentioning that your iOS device will become jailbreak after using this software. And if it will be activation locked again if you restart/reset/upgrade your device after bypassing iCloud activation lock. After activation lock removal, you can access to all features in your device except for the function of phone call, cellular data and log in to iCloud of new Apple ID from Settings. However, you can sign in a new Apple ID through App Store to download apps via Wi-Fi.
Here is a guide of how to use this tool for iCloud lock unlock.
Step 1. Download this tool to a PC or Mac computer, and connect your iCloud locked device to computer via USB cable.
Step 2. This software provides a jailbreak tool. Scripte trained. Wait for the jailbreak tool to be downloaded and follow the onscreen instructions to complete the jailbreak process.
Step 3. When the jailbreak completes, click the Start Remove button to start removing the activation lock.
The Bottom Line
From the above words you are about to understand that unlocking iPhone immediately is easier than what you think. Hope you could master the paid or free iPhone unlock service 2020 and leave your comments once you have any doubts. And for iPhone iCloud activation lock unlock, UltFone Activation Unlocker is the best choice.
- Remove activation lock without previous owner
- Log in App Store with new Apple ID after activation lock removal
- Compatible with iOS devices from iPhone 5S to iPhone X
- Fully support iOS 12.3-13.6

